Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Optoma - UHZ65UST | ViewSonic - X2-4K |
|---|---|---|
| Brightness | 3500 lm | 2900 lm |
Between the UHZ65UST and X2-4K, the UHZ65UST comes out ahead in brightness, while the X2-4K wins on several specs. Overall, the UHZ65UST scores 78.2 and the X2-4K scores 73.5 on our Mars Score.
Which should you buy?
The UHZ65UST edges ahead on the Mars Score (78.2 vs 73.5), but the 4.7-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the UHZ65UST if you care most about brightness. The biggest gaps in its favor are brightness. The single most decisive one: Brightness — 20.69% more. 3500 lm vs 2900 lm.
The X2-4K similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable resolution, light source, short-throw, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Optoma - UHZ65UST or ViewSonic - X2-4K?
Optoma - UHZ65UST leads the current Mars Score by 4.7 points.The more useful decision is the trade-off behind that result: compare brightness against the way you will actually use the product.
Choose Optoma - UHZ65UST if…
Optoma - UHZ65UST has the measurable edge on brightness lumens.
Choose ViewSonic - X2-4K if…
ViewSonic - X2-4K does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Optoma - UHZ65UST wins
- ▲Brightness — 20.69% more. 3500 lm vs 2900 lm.
Why ViewSonic - X2-4K wins
- No decisive advantages.
Spec comparison
Image
| Spec | Optoma - UHZ65UST | ViewSonic - X2-4K |
|---|---|---|
| Resolutionⓘ | 4K | 4K |
| Brightnessⓘ | 3500 lmlead | 2900 lm |
| Contrast | 2500000:1 | 3000000:1 |
| Light source | Laser | Laser |
| Short-throw | true | true |
Smart & Connectivity
| Spec | Optoma - UHZ65UST | ViewSonic - X2-4K |
|---|---|---|
| Smart OS | None | Google TV |
| HDMI inputs | 3lead | 2 |
| Built-in speakers | true | true |