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There is no evidence-backed head-to-head winner between Roku’s 2026 Pro Series OLED and LG’s 2025 B5 OLED. The available independent Roku test did not include an LG B-series TV, so it cannot establish which set is brighter or better overall. Compare the same screen size and current price, then choose based on the features and smart-TV system you prefer. This comparison covers the verified 2025 LG B5; the available official material does not establish B6 specifications.
Which models are being compared?
Roku’s standard Pro Series OLED is a 2026 family available in 55- and 65-inch sizes. LG announced its 2025 B5 in 55, 65, 77, and 83 inches. Because “B-series” spans model years, make sure any LG listing you consider is actually a B5 before applying the specifications here.
Both product lines offer 4K OLED panels with refresh rates up to 120Hz and Dolby Vision. The standard Roku Pro OLED also supports HDR10+; LG lists HDR10 Pro for the B5. Format labels alone do not establish which TV delivers the better HDR picture.
Roku Pro OLED vs. LG B5 at a glance
| Feature | Roku Pro Series OLED (2026) | LG OLED B5 (2025) |
|---|---|---|
| Verified sizes | 55 and 65 inches (Roku product and support pages: Roku; Roku support) | 55, 65, 77, and 83 inches (LG announcement: LG Electronics) |
| Panel and refresh | 4K OLED, up to 120Hz (Roku support: Roku) | OLED, up to 120Hz (LG announcement: LG Electronics) |
| HDR formats listed | Dolby Vision and HDR10+ (Roku support: Roku) | Dolby Vision and HDR10 Pro (LG announcement: LG Electronics) |
| Sound format | Dolby Atmos (Roku support: Roku) | Dolby Atmos (LG announcement: LG Electronics) |
| Gaming features stated | VRR, ALLM, FreeSync Premium, HDMI 2.1; Roku says gaming is supported up to 4K/120fps. (Roku product page: Roku) | VRR, NVIDIA G-Sync, and AMD FreeSync Premium (LG announcement: LG Electronics) |
| Smart-TV platform | Roku OS (Roku support: Roku) | webOS; LG advertises more than 300 free LG Channels and up to five years of webOS Re:New updates on its US B5 page. Channel access and update eligibility can vary by country and model. (LG US) |
| Listed US price by size | $999.99 (55-inch) and $1,199.99 (65-inch), as listed on Roku’s US product page when accessed; prices can change. (Roku) | $1,499.99 (55-inch), $1,999.99 (65-inch), $2,999 (77-inch), and $4,499 (83-inch), as listed on LG’s US page when accessed; these are page-listed prices, not a same-time sale comparison. (LG US) |
How do the pictures compare?
OLED and HDR format support do not tell the whole picture-quality story. Room brightness, picture mode, panel behavior, and test method matter. The evidence available does not provide a direct, comparable Roku-versus-B5 lab test.
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- TVs from TV experts: From America’s number 1 TV streaming platform*, the thoughtfully-designed Roku Pro Series OLED TV combines the delightfully simple Roku experience with picture you have to see to believe. *Based on hours streamed—Hypothesis Group
- 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.
- OLED? Oh wow: Thanks to OLED technology, this TV lets you see colors at their most vibrant and blacks that are truly black.
- Picture, perfected: Roku Smart Picture Max automatically tunes your TV to best suit what you’re watching—no fiddling with settings required.
What the Roku measurements show
Tom’s Guide’s Michael Desjardin reported its Roku Pro OLED measurements on September 24, 2026: 331 nits SDR brightness and 574 nits HDR brightness, both measured at a 10% window; Delta-E was 2.3, and Rec. 2020 gamut coverage was 70.7%. Those are results from that outlet’s test, not a guarantee for every unit. Tom’s Guide used Movie mode for Roku’s SDR reading and HDR Dark with Display Brightness set to Brighter for its HDR reading. Its comparisons with the LG C6 and Samsung S90H used Filmmaker mode, so the conditions were not identical. (Tom’s Guide)
These numbers provide context about the tested Roku set, but they do not answer whether it is brighter than the B5. No directly comparable B5 measurement is established here. Roku positions the standard Pro OLED for cinematic viewing in a dark room and describes the separate Pro LX as its brighter OLED; that is Roku’s product positioning, not independent evidence of how the standard Pro compares with the B5. (Roku)
Rank #2
- TVs from TV experts: From America’s number 1 TV streaming platform*, the thoughtfully-designed Roku Pro Series OLED TV combines the delightfully simple Roku experience with picture you have to see to believe. *Based on hours streamed—Hypothesis Group
- 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.
- OLED? Oh wow: Thanks to OLED technology, this TV lets you see colors at their most vibrant and blacks that are truly black.
- Picture, perfected: Roku Smart Picture Max automatically tunes your TV to best suit what you’re watching—no fiddling with settings required.
Which is better for gaming?
Both brands document 120Hz-class gaming support on these models. Roku lists VRR, ALLM, FreeSync Premium, HDMI 2.1 and support for gaming up to 4K/120fps on the standard Pro OLED. LG lists VRR, G-Sync and FreeSync Premium for the B5. The cited B5 material does not specify ALLM or HDMI port counts, so compare the exact model documentation if those details affect your setup.
Do not confuse the standard Roku Pro OLED with the Pro LX: Roku says the LX supports VRR up to 144Hz, while the standard model is the 120Hz product. The 144Hz figure should not be attributed to the standard Pro.
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Rank #3
- Dazzling picture: Watch larger-than-life colors pop off the QLED screen and dive into vivid highlights, deeper darks, and realistic depth with thousands of mini-LEDs. Bring entertainment to life with brilliant Dolby Vision IQ technology.
- Your new centerpiece: With our custom mount, your TV sits flat against the wall. Check out offers under TV size options above to bundle a TV and mount. Browse famous artists or upload your photos and turn your TV into a digital gallery with Backdrops.
- 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.
- Blistering speed: Roku Pro Series TVs let you follow the action with a 120Hz refresh rate perfect for gaming and watching live sports.
What about price and size?
Roku’s listed 55-inch and 65-inch prices are lower than the corresponding B5 page-listed US figures, but this is not a like-for-like current sale comparison. Manufacturer pages and retailer offers change, and the prices were not established as simultaneous discounts. Check the live price of the same size and confirm the model year before deciding which is the better value.
The B5 is the only one of these verified families with 77- and 83-inch options. If you need a larger screen, the Roku Pro OLED sizes listed here do not match those choices.
Rank #4
- Dazzling picture: Watch larger-than-life colors pop off the QLED screen and dive into vivid highlights, deeper darks, and realistic depth with thousands of mini-LEDs. Bring entertainment to life with brilliant Dolby Vision IQ technology.
- Your new centerpiece: With our custom mount, your TV sits flat against the wall. Check out offers under TV size options above to bundle a TV and mount. Browse famous artists or upload your photos and turn your TV into a digital gallery with Backdrops.
- 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.
- Blistering speed: Roku Pro Series TVs let you follow the action with a 120Hz refresh rate perfect for gaming and watching live sports.
Which smart-TV system suits you?
The Roku Pro OLED has Roku OS built in. The B5 uses LG webOS; LG’s US product page advertises more than 300 free LG Channels and up to five years of webOS Re:New updates, subject to regional and model eligibility. App availability and platform preferences are personal, so check that the services you use are available on the specific TV in your country.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which TV should you buy?
Choose Roku Pro Series OLED if…
- You specifically want Roku OS built into the TV.
- The 55- or 65-inch size fits your room and the current same-size price is compelling to you.
- You want the formats and gaming features Roku lists for its standard Pro OLED, including Dolby Vision, HDR10+, VRR, ALLM, and FreeSync Premium.
Choose LG B5 if…
- You want a 77- or 83-inch option, or LG’s webOS experience.
- Filmmaker Mode, Dolby Vision, G-Sync, or the B5’s documented gaming feature set aligns with your needs.
- You have checked that the listing is for the 2025 B5 and its current price makes sense for the size.
If picture brightness is your deciding factor, do not use the Roku test figures as proof that it beats the B5. The cited independent test does not include the B-series, and a reliable head-to-head verdict requires comparable measurements of the exact models you are considering.
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Best Value
- Elevate your entertainment: For TV buffs with taste—the Roku Pro Series TV is your centerpiece. Enjoy a powerfully simple streaming experience with brilliant 4K picture, immersive audio, and an elegant design. 55-Inch smart TV.
- Bright, colorful picture: Watch rich, accurate hues pop off the QLED screen. Movies, TV and games come to life in exceptional clarity with Dolby Vision IQ.
- Razor-sharp details: Dive into vivid highlights, deeper darks, and realistic depth with thousands of mini-LEDs that send light to the right places.
- Blistering speed: Follow the action with a blazing-fast 120Hz refresh rate—perfect for watching live sports and gaming.
- Picture, perfected: Powered by AI, Roku Smart Picture Max cleans up incoming TV signals, optimizes them for your TV, and automatically refines the color and sharpness for every show, sporting event, and even subtle scene changes.
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.
