LG B4 55" vs Roku Plus Series 55"
The Verdict
LG's B4 represents a premium OLED experience with its superior 1100-nit brightness, 120Hz refresh rate, and sophisticated α8 Gen 7 processor delivering exceptional contrast and color accuracy. Roku's Plus Series offers remarkable value at one-third the price, featuring QLED technology, Wi-Fi 6 connectivity, and respectable HDR support via Dolby Vision and HDR10+. Picture quality heavily favors the B4, whose OLED panel produces perfect blacks and superior motion handling with 1ms input lag versus Roku's 13ms. Gaming performance distinctly advantages LG with VRR support and 120Hz capability. However, Roku's lighter design, better wireless connectivity, and Roku OS simplicity appeal to budget-conscious buyers prioritizing ease of use. Audio proves comparable with both offering 2.0 channels and Dolby Atmos. Choose the LG B4 if gaming and cinematic image quality matter; select Roku for everyday streaming on a tight budget.
Who Should Buy
Buy the LG B4 55" if…
- →Lowest-cost entry into LG's OLED lineup with the same perfect blacks
- →All four HDMI ports with VRR and ALLM at 4K@120Hz for gaming
- →Dolby Vision and Dolby Atmos at an entry OLED price
Buy the Roku Plus Series 55" if…
- →Roku OS is the simplest, cleanest smart TV platform available
- →Dolby Vision, HDR10+, AND Dolby Atmos decoding — unusual at $399
- →Works with every voice assistant: Alexa, Google, Siri (via AirPlay)
Category Scores
Pros & Cons
LG B4 55"
Pros
- Lowest-cost entry into LG's OLED lineup with the same perfect blacks
- All four HDMI ports with VRR and ALLM at 4K@120Hz for gaming
- Dolby Vision and Dolby Atmos at an entry OLED price
- webOS 24 is one of the best smart TV interfaces available
Cons
- Only two HDMI 2.1 ports — the other two are HDMI 2.0 (limited to 4K@60Hz)
- α8 processor is noticeably weaker than the C4's α9 for upscaling and processing
- Lower peak brightness than the C4 or G4 — HDR highlights lack some punch
- No Wi-Fi 6, which limits wireless bandwidth in crowded network environments
- OLED burn-in risk remains a concern for heavy static-content users
Roku Plus Series 55"
Pros
- Roku OS is the simplest, cleanest smart TV platform available
- Dolby Vision, HDR10+, AND Dolby Atmos decoding — unusual at $399
- Works with every voice assistant: Alexa, Google, Siri (via AirPlay)
- Wi-Fi 6 for reliable 4K streaming
- QLED color enhancement is visible versus basic LED panels
Cons
- 60Hz panel — no 120Hz or gaming features
- 700-nit brightness is okay but not impressive for HDR highlights
- Roku's ad-supported free channels are prominently pushed in the UI
- No VRR for next-gen console gaming
Full Specifications
| Spec | LG B4 55" | Roku Plus Series 55" |
|---|---|---|
| Body | ||
| VESA mount | 200 x 200mm | 200 x 200mm |
| Weight | 41.9 lbs | 26.5 lbs |
| Dimensions (w/ stand) | 48.4 x 32.1 x 10.5 inches | 48.4 x 30.6 x 10.2 inches |
| Audio | ||
| Output (watts) | 40 | 20 |
| Speakers | 2.0ch | 2.0ch |
| Dolby Atmos | ||
| Gaming | ||
| VRR (Variable Refresh Rate) | ||
| ALLM | ||
| Input lag (ms) | 1 | 13 |
| Display | ||
| HDR | Dolby Vision IQ, HDR10, HLG, Filmmaker Mode | Dolby Vision, HDR10+, HLG |
| Size | 55" | 55" |
| Type | OLED | QLED |
| Resolution | 3840 x 2160 (4K UHD) | 3840 x 2160 (4K UHD) |
| Refresh rate | 120Hz | 60Hz |
| Brightness (nits) | 1100 | 700 |
| Smart TV | ||
| Os | webOS 24 | Roku OS |
| Voice assistant | ThinQ AI, Alexa, Google Assistant | Roku Voice, Alexa, Google Assistant, Apple AirPlay 2 |
| Processor | ||
| Chipset | α8 Gen 7 AI Processor 4K | Quad-core |
| Connectivity | ||
| Wi-Fi | Wi-Fi 5 (802.11ac) | Wi-Fi 6 (802.11ax) |
| Ethernet | ||
| Bluetooth | 5.0 | 5.2 |
| USB ports | 3 | 1 |
| HDMI ports | 4 | 4 |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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