Between the X3100i and UHD35STx, the X3100i comes out ahead in light source, while the UHD35STx wins on brightness and short-throw. Overall, the X3100i scores 84.6 and the UHD35STx scores 89.1 on our Mars Score.
Which should you buy?
The UHD35STx edges ahead on the Mars Score (84.6 vs 89.1), but the 4.5-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the X3100i if you care most about light source. The biggest gaps in its favor are light source.
Pick the UHD35STx if you care most about brightness and short-throw. Its strongest claims are brightness, short-throw.
Both ship with comparable resolution, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why BenQ - X3100i wins
- ▲Light source: LED (vs Lamp).
Why Optoma - UHD35STx wins
- ▲Brightness — 9.09% more. 3600 lm vs 3300 lm.
- ▲Short-throw: true (vs false).
Spec comparison
Image
| Spec | BenQ - X3100i | Optoma - UHD35STx |
|---|---|---|
| Resolutionⓘ | 4K | 4K |
| Brightness | 3300 lm | 3600 lmlead |
| Contrast | 600000:1 | 1000000:1 |
| Light source | LEDlead | Lamp |
| Short-throw | false | truelead |
Smart & Connectivity
| Spec | BenQ - X3100i | Optoma - UHD35STx |
|---|---|---|
| Smart OS | Android TV | None |
| HDMI inputs | 2 | 2 |
| Built-in speakers | true | true |
Spec-level deep dives
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