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There is no evidence-based universal winner. Roku’s 2026 Pro Series OLED is the better fit if you want Roku OS, a 120Hz OLED with Dolby Vision and HDR10+, and a straightforward 55- or 65-inch purchase at Roku’s listed prices. LG’s 2025 B5 is the stronger candidate for buyers who need NVIDIA G-Sync, broad PC-gaming support, or an LG-centered setup. Compare the same screen size at live prices, then decide on gaming inputs, room lighting, HDR needs, and software preference. No controlled test directly comparing these two televisions establishes that one is brighter, more accurate, or better overall.
What this comparison actually covers
These are not same-year products. The Roku Pro Series OLED is a 2026 line, while the relevant LG model is the 2025 LG OLED B5. “LG B-series OLED” is too broad for a buying decision, so the specifications below refer specifically to the B5. Availability, model suffixes, tuner configuration, warranty terms, and software features can vary by country and retailer.
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Roku also sells a separate Pro Series LX variant. The LX is not the standard Pro OLED discussed here: Roku describes the LX as having a brighter picture, a wider color range, and up to 144Hz variable refresh. Those claims must not be applied to the standard Pro models.
At-a-glance verdict
| Choose this | When it makes the most sense |
|---|---|
| Roku Pro Series OLED | You prefer Roku OS, want Dolby Vision and HDR10+, need 4K gaming up to 120 frames per second, and find the same-size Roku cheaper or easier to obtain. |
| LG B5 | You use a gaming PC and specifically need NVIDIA G-Sync, want LG’s picture modes and interface, or find the B5 substantially cheaper at the same size. |
| Neither by default | You are comparing different sizes, relying on an old MSRP, or expecting the LX’s 144Hz specification from the standard Roku Pro. |
Both televisions are 4K OLEDs with 120Hz-class gaming support. The practical winner is therefore determined less by the panel label than by the exact price, your connected devices, and the platform you will use every day.
#1 Best Overall
- OUR MOST ADVANCED 4K AI PROCESSOR: Powered by 128 neural networks to deliver AI-enhanced picture and optimized sound, resulting in an exceptional 4K experience for streaming, gaming, live sports and more.*
- TRANSFORMS EVERYTHING ON SCREEN TO IMPRESSIVE 4K RESOLUTION*: See impressive details on screen. Our AI processor upscales everything you watch to 4K using 128 AI neural networks and ensures incredibly sharp and smooth picture quality.*
- POWERFUL BRIGHTNESS AND DEEPER CONTRAST IN EVERY PIXEL**:Experience powerful brightness and deeper contrast revealing nuanced detail in each scene. The NQ4 AI Gen3 processor analyzes each scene and boost brightness to illuminate even the smallest details.**
- BRINGS SMOOTH MOTION TO SPORTS AND TEAR-FREE GAMING: Experience smooth visuals and elite speeds for VRR gaming at up to 4K 144Hz.***
- KEEP YOUR EYE ON THE BALL: The AI processor smooths the motion of fast-moving balls and text, reducing blur and flickering, so you don't lose sight of the action.*
Product identity and model numbers
Roku Pro Series OLED
Roku’s official material names the standard models 55RAD5 and 65RAD5 and lists 55- and 65-inch configurations. Roku’s support chart for the 2026 OLED generation uses 55RADX and 65RADX codes, so the final letter or suffix may differ by market or retailer. Match the complete code on the carton and product page before ordering; do not assume every “Pro OLED” listing is the same regional SKU.
Roku describes the television as “A 4K OLED display with 120Hz refresh rate, Dolby Vision, and Roku Smart Picture Max.” That is a manufacturer description, not an independent measurement. The standard Pro specification list also includes HDR10+, HLG, Dolby Atmos, HDMI 2.1, Ethernet, Bluetooth, USB-C, USB-A, FreeSync Premium, and 4K gaming up to 120fps.
LG OLED B5
LG’s US 55-inch product page identifies the model as OLED55B5PUA. LG announced B5 sizes of 55, 65, 77, and 83 inches. Its launch announcement lists Dolby Vision, Dolby Atmos, HDR10 Pro, FILMMAKER MODE, NVIDIA G-Sync, AMD FreeSync Premium, VRR, and refresh rates up to 120Hz. A different suffix can indicate a different market, tuner, stand, or warranty package.
Core specifications
| Feature | Roku Pro Series OLED (standard) | LG B5 |
|---|---|---|
| Release generation | 2026 | 2025 |
| Panel type | OLED; Roku lists 4K resolution | 4K WOLED, according to RTINGS’ B5/C5 comparison |
| Sizes identified in the supplied manufacturer material | 55 and 65 inches | 55, 65, 77 and 83 inches |
| Native or maximum refresh information | 120Hz | Up to 120Hz; RTINGS identifies the B5 as native 120Hz |
| HDR formats listed | Dolby Vision, HDR10+, HLG | Dolby Vision, HDR10 Pro |
| Audio formats listed | Dolby Atmos | Dolby Atmos |
| Gaming features listed | HDMI 2.1, FreeSync Premium, 4K gaming up to 120fps | VRR, NVIDIA G-Sync, AMD FreeSync Premium, up to 120Hz |
| Connections specifically listed | Ethernet, Bluetooth, USB-C and USB-A; HDMI 2.1 | Not fully itemized in the cited launch material; verify the exact regional specification |
| Smart-TV software | Roku OS | LG’s smart-TV platform; interface and apps can vary by region |
The table separates manufacturer specifications from independent testing. “Up to 120Hz” does not mean every input, resolution, or game will run at that rate; the source device, cable, port, game mode, and regional firmware all matter.
Price and availability: compare equal sizes on the same day
Roku’s official listing showed the standard 55-inch Pro OLED at $999.99 and the 65-inch model at $1,199.99 when accessed for this comparison. These are live listing prices and can change with promotions, inventory, region, and retailer policy. They are not a permanent MSRP guarantee.
LG’s May 12, 2025 launch announcement states an $4,499 launch price for the 83-inch B5 and confirms that 55-, 65-, and 77-inch models would be sold through LG-authorized retailers. It does not establish current street prices for those smaller sizes. Do not calculate a present-day saving against that dated 83-inch launch figure.
Rank #2
- INTELLIGENT TV PROCESSING – The Cognitive Processor XR understands how humans see the real world to deliver intense contrast with deep blacks, high peak brightness, and natural colors..Standby Power :＜0.5 watts
- OLED CONTRAST – XR OLED Contrast Pro technology allows you to feel the beauty of OLED with immersive depth and realism, pure black, and lifelike brightness.
- WIDE SPECTRUM OF COLORS - Rediscover everything you watch with billions of accurate colors and see impressive picture quality that is natural and beautiful, enhanced by XR Triluminos Pro.
- ALL YOUR GAME SETTINGS IN ONE PLACE– Game Menu puts all your gaming picture settings and exclusive assist features in a single easy-to-manage interface.
- PERFECT FOR PLAYSTATION 5 – Take your gaming to the next level with input lag as low as 8.5ms and BRAVIA XR exclusive features for the PlayStation 5 – Auto HDR Tone Mapping Auto Genre Picture Switch.
| Size | Roku Pro OLED price information | LG B5 price information | What to verify before purchase |
|---|---|---|---|
| 55-inch | $999.99 listed price for the standard model; volatile | Launch availability confirmed; current matched-size price not stated | Exact model code, live price, delivery, return window and warranty |
| 65-inch | $1,199.99 listed price for the standard model; volatile | Launch availability confirmed; current matched-size price not stated | Whether a sale applies to the same B5 regional SKU |
| 77-inch | Not listed for the standard Pro models in the cited material | Launch availability confirmed; current price not stated | Do not treat a larger B5 as a direct price match to a Roku 65-inch |
| 83-inch | Not listed for the standard Pro models in the cited material | $4,499 launch price, announced May 12, 2025 | Current stock and price; the launch figure is historical |
A fair comparison uses the same diagonal size, includes delivery and return costs, and checks whether the seller is authorized. A discounted 65-inch B5 should be compared with the 65-inch Roku, not with an 83-inch B5 or an LX model.
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Picture quality and HDR: what is established
OLED benefits are shared
Both televisions use OLED technology, so each is designed for pixel-level light control, very deep blacks, and wide viewing angles. Those are characteristics of the display class, not proof that the two models have identical processing, brightness, reflection handling, or calibration.
Roku’s format advantage
Roku lists Dolby Vision, HDR10+, and HLG on the standard Pro OLED. That gives compatible streaming services and playback devices several HDR paths. The set’s Smart Picture Max processing is likewise a Roku feature claim; it is not a substitute for a measured comparison of peak brightness, tone mapping, or color volume.
LG B5 formats and modes
LG lists Dolby Vision, HDR10 Pro, and FILMMAKER MODE for the B5. Dolby Vision support overlaps with Roku, while HDR10 Pro is LG’s named HDR processing feature. The two brands use different terminology, so identical source content can still receive different tone-mapping and picture-processing treatment.
Do not overread the available review numbers
TechRadar measured 71% BT.2020 coverage for the Roku Pro Series OLED in Filmmaker Mode and compared it with 72.5% for an LG B6. The B6 is not the B5, and this one color-gamut metric cannot determine an overall winner. Tom’s Guide likewise reported that the LG B6 had higher HDR brightness, was slightly more color-accurate, and offered a more full-featured game mode with lower input latency than the Roku Pro OLED. Those observations concern a B6 comparison, not a controlled Roku-versus-B5 test.
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Rank #3
- Breathtaking picture: Sharp 4K brings out rich detail on our 55" flat screen TV, while the QLED screen and HDR10 create bright, accurate colors. Roku Smart Picture cleans up incoming TV signals, optimizes them, and chooses the right picture mode.
- Seamless streaming: With fast Wi-Fi and apps that launch in a snap, Roku Select Series TVs get you to your entertainment quickly. You get excellent picture quality, clear sound, automatic updates, and more. It’s simple to use. Hard to outgrow.
- TV, simplified: With setup that only takes minutes, a simple-to-navigate Home Screen, and an uncluttered remote control that does all you need—Roku makes it easier to watch the TV you love.
- A world of free entertainment: Enjoy a huge selection of free live TV, news, sports, movies, shows, and much more—all just a click away.
- More streaming, less searching: With personalized picks right on your Home Screen, quick access to the sports and entertainment you watch most, and fast and easy search in one place—the days of endless scrolling are over.
Gaming: 120Hz is the common ceiling in this comparison
The standard Roku Pro OLED is specified at 120Hz. The LG B5 is also specified for up to 120Hz, and RTINGS identifies it as native 120Hz. Neither should be sold to you as a 144Hz television. Roku’s 144Hz VRR statement belongs to the separate Pro Series LX.
| Gaming need | Roku Pro Series OLED | LG B5 | Buying implication |
|---|---|---|---|
| PlayStation 5 or Xbox Series X at 4K/120 | Roku lists HDMI 2.1 and 4K gaming up to 120fps | LG lists VRR and up to 120Hz | Both are plausible matches; verify the console’s signal appears at 4K/120 on the exact port. |
| Variable refresh | FreeSync Premium listed | VRR and AMD FreeSync Premium listed | Both support variable refresh, but compatibility depends on the source and settings. |
| PC with an NVIDIA graphics card | FreeSync Premium is listed; G-Sync is not stated | NVIDIA G-Sync is explicitly listed | The B5 is the safer specification match when G-Sync is a requirement. |
| PC above 120 frames per second | Standard Pro specification is 120Hz | B5 specification is up to 120Hz | Neither model in this comparison provides an established 144Hz mode. |
| Input-lag preference | No direct Roku-versus-B5 latency result is established | No direct Roku-versus-B5 latency result is established | Use exact-model measurements, not B6 commentary, before choosing on latency alone. |
Check the complete signal chain
- Confirm that the console or PC can output 4K at 120Hz and supports the desired VRR standard.
- Use a certified high-bandwidth HDMI cable and connect it to the television input identified for the required signal.
- Enable the console’s 120Hz and VRR options, then select the television’s game mode if the interface requires it.
- On a PC, select 3840×2160 at 120Hz in the operating system or graphics driver and enable G-Sync or compatible VRR only after the display is detected.
- Check the television’s information panel while a game is running. A 120Hz panel does not guarantee a 120Hz signal if the source, cable, port, or game is limited.
Room lighting, reflections and viewing habits
OLED is usually most compelling when you watch films, series, and games from a centered position where black-level performance matters. In a room with windows or strong lamps, reflections and peak-brightness behavior can matter more than the badge on the bezel. The available evidence does not provide a controlled brightness or glare comparison between these exact sets.
For a bright room, compare the retailer’s return policy and seek exact-model measurements of sustained HDR brightness, full-screen brightness, and reflection handling. For a dark cinema room, prioritize calibration controls, accurate modes, and the HDR formats used by your preferred services. Do not assume the Roku Pro is brighter because the separate LX is described as brighter; the LX is a different product.
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Smart-TV software: Roku OS versus LG’s platform
Roku’s standard Pro uses Roku OS. That makes it the natural choice for households already organized around Roku profiles, remotes, search habits, and app availability. Before buying, confirm that every service you use is available in your country and on the television’s current software version.
The B5 uses LG’s smart-TV platform. It is the better fit when your other equipment, remote-control habits, picture presets, or home-theater workflow already center on LG. App catalogs, voice features, advertising, and interface labels can differ by region, so a review from another country may not describe your unit exactly.
Neither platform changes the panel’s refresh limit. Choose software for the daily tasks—input switching, searching, live-TV use, profiles, and updates—you will perform more often than for a feature you may never enable.
A practical buying procedure
- Fix the size first. Decide whether 55 or 65 inches fits your viewing distance and furniture. If you need 77 or 83 inches, the B5 has announced sizes that the standard Roku Pro listing does not.
- Write down the exact model code. For the US B5, the cited 55-inch code is OLED55B5PUA. Roku’s standard codes are listed as 55RAD5 and 65RAD5, while Roku’s support chart uses 55RADX and 65RADX for the 2026 generation. Confirm the complete local suffix.
- Record live, matched prices. Include delivery, taxes, an extended warranty if you actually want one, and the seller’s return conditions. Ignore expired launch prices.
- List your gaming devices. Console-only 4K/120 play is a different requirement from a PC that specifically needs G-Sync. Pick the set whose stated features match the device you own.
- List your HDR sources. If HDR10+ support is important, Roku lists it. If your priority is LG’s Dolby Vision, HDR10 Pro, and FILMMAKER MODE package, the B5 lists those features.
- Check the room. Note direct sunlight, lamps opposite the screen, and whether you watch mostly at night. Seek exact-model glare and brightness data when those conditions dominate.
- Verify after delivery. Photograph the model label, inspect the panel and screen surface before removing protective film, update firmware, and test every important HDMI source during the return period.
Common mistakes to avoid
- Comparing different sizes as if they were equivalent. A 65-inch price cannot prove that a 55-inch model is a better value.
- Confusing Pro OLED with Pro Series LX. The LX’s brighter-picture, wider-color-range, and 144Hz VRR descriptions do not establish those features for the standard Pro.
- Using LG B6 reviews as B5 test results. The B6 comparisons from TechRadar and Tom’s Guide are context about another LG generation, not direct evidence against the B5.
- Reading “120Hz” as a guaranteed game frame rate. The source device, game, cable, port, and settings must all support the signal.
- Treating a launch price as today’s deal. LG’s $4,499 figure applies to the announced 83-inch B5 launch and is dated May 12, 2025.
- Assuming a regional SKU is identical. Model suffixes can change with market, tuner, stand, warranty, and software configuration.
- Choosing on one gamut percentage. Roku’s 71% BT.2020 figure and the 72.5% B6 comparison do not measure the complete picture-quality experience.
Which buyer should choose which TV?
Choose the Roku Pro Series OLED when
- You want Roku OS and its familiar search, app, and remote workflow.
- The same-size Roku is less expensive at the time you buy it.
- You value the listed combination of Dolby Vision, HDR10+, HLG, HDMI 2.1, and FreeSync Premium.
- Your gaming target is 4K at up to 120fps rather than 144Hz PC play.
Choose the LG B5 when
- You need explicitly listed NVIDIA G-Sync for a gaming PC.
- You want LG’s Dolby Vision, HDR10 Pro, FILMMAKER MODE, and VRR feature set.
- You need a 77- or 83-inch option identified in the manufacturer announcement.
- A matched-size B5 sale gives you a meaningful price advantage over the Roku.
Wait or gather more evidence when
- Your decision depends on peak brightness, reflection handling, or input latency.
- You are buying outside the market covered by the cited model numbers.
- The retailer does not clearly identify whether the Roku is standard Pro or Pro Series LX.
Bottom line
Buy the Roku Pro Series OLED for the Roku experience and its listed 120Hz, Dolby Vision, HDR10+, HDMI 2.1, and FreeSync Premium package when the live price is right. Buy the LG B5 when G-Sync, LG’s picture modes, a larger announced size, or a better matched-size sale matters more. The available reviews do not justify declaring either television the universal winner: they compare Roku with LG’s B6, not directly with the B5. Verify the exact regional model, current price, gaming signal, and return policy before paying.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
