Roku Plus Series 55" vs Vizio M-Series 55"
The Verdict
Both 55-inch TVs deliver solid 4K performance at competitive price points, but they cater to different priorities. Roku Plus excels with its comprehensive smart TV ecosystem, supporting Roku OS, Alexa, Google Assistant, and Apple AirPlay 2 simultaneously, plus Dolby Atmos audio from its 20W 2.0ch speakers. The QLED panel reaches 700 nits brightness with full HDR support and handles gaming reasonably at 13ms input lag, though it caps out at 60Hz refresh rate. Vizio M-Series steps ahead for gaming and motion handling with native 120Hz refresh rate, variable refresh rate support, and snappier 8ms input lag, making it noticeably better for fast-paced content. Its Quantum LED display hits 800 nits for superior brightness and punchier contrast. However, Vizio omits Dolby Atmos and offers fewer voice assistant integrations through SmartCast OS. At $399 versus $449, Roku Plus delivers better overall value with its versatile software experience and acceptable gaming performance. Choose Vizio only if you prioritize high-refresh gaming and maximum brightness; otherwise Roku Plus serves most viewers better for the lower price.
Who Should Buy
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)
Buy the Vizio M-Series 55" if…
- →120Hz with VRR and 4K@120Hz at under $450 is great for console gamers
- →Dolby Vision and HDR10+ dual support
- →Four HDMI 2.1 ports — enough for every console and streaming device
Category Scores
Pros & Cons
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
Vizio M-Series 55"
Pros
- 120Hz with VRR and 4K@120Hz at under $450 is great for console gamers
- Dolby Vision and HDR10+ dual support
- Four HDMI 2.1 ports — enough for every console and streaming device
- Wi-Fi 6 and Chromecast built-in for fast streaming
- Quantum color delivers better color volume than basic LED
Cons
- SmartCast OS is slow and has fewer apps than Google TV
- 800-nit brightness is adequate but not impressive for HDR
- No local dimming zones — contrast is limited
- Vizio's long-term software support and update track record is inconsistent
Full Specifications
| Spec | Roku Plus Series 55" | Vizio M-Series 55" |
|---|---|---|
| Body | ||
| VESA mount | 200 x 200mm | 200 x 200mm |
| Weight | 26.5 lbs | 28.0 lbs |
| Dimensions (w/ stand) | 48.4 x 30.6 x 10.2 inches | 48.3 x 30.4 x 10.6 inches |
| Audio | ||
| Output (watts) | 20 | 20 |
| Speakers | 2.0ch | 2.0ch |
| Dolby Atmos | ||
| Gaming | ||
| VRR (Variable Refresh Rate) | ||
| ALLM | ||
| Input lag (ms) | 13 | 8 |
| Display | ||
| HDR | Dolby Vision, HDR10+, HLG | Dolby Vision, HDR10+, HLG |
| Size | 55" | 55" |
| Type | QLED | Quantum LED |
| Resolution | 3840 x 2160 (4K UHD) | 3840 x 2160 (4K UHD) |
| Refresh rate | 60Hz | 120Hz (native) |
| Brightness (nits) | 700 | 800 |
| Smart TV | ||
| Os | Roku OS | SmartCast OS |
| Voice assistant | Roku Voice, Alexa, Google Assistant, Apple AirPlay 2 | Google Assistant, Apple AirPlay 2, Chromecast |
| Processor | ||
| Chipset | Quad-core | IQ Active Processor |
| Connectivity | ||
| Wi-Fi | Wi-Fi 6 (802.11ax) | Wi-Fi 6 (802.11ax) |
| Ethernet | ||
| Bluetooth | 5.2 | 5.0 |
| USB ports | 1 | 1 |
| HDMI ports | 4 | 4 |
Want to compare a third product?
Add another product for a 3-way comparison.
Related Comparisons
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.
Explore more in tvs, see all Roku products or all Vizio products. View full details for the Roku Plus Series 55" or the Vizio M-Series 55".