Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | BenQ - X3100i | Optoma - UHZ65UST |
|---|---|---|
| Brightness | 3300 lm | 3500 lm |
| Light source | LED | Laser |
| Short-throw | false | true |
Between the X3100i and UHZ65UST, the X3100i comes out ahead in several specs, while the UHZ65UST wins on brightness / light source. Overall, the X3100i scores 76.6 and the UHZ65UST scores 78.2 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.6 vs 78.2). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
The X3100i does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the UHZ65UST if you care most about brightness / light source. Its strongest claims are brightness, light source, short-throw. The single most decisive one: Brightness — 6.06% more. 3500 lm vs 3300 lm.
Both ship with comparable resolution, 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: BenQ - X3100i or Optoma - UHZ65UST?
Optoma - UHZ65UST leads the current Mars Score by 1.6 points.The more useful decision is the trade-off behind that result: compare brightness, light source, short-throw against the way you will actually use the product.
Choose BenQ - X3100i if…
BenQ - X3100i does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Optoma - UHZ65UST if…
Optoma - UHZ65UST has the measurable edge on brightness lumens, light source, is short throw.
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 BenQ - X3100i wins
- No decisive advantages.
Why Optoma - UHZ65UST wins
- ▲Brightness — 6.06% more. 3500 lm vs 3300 lm.
- ▲Light source: Laser (vs LED).
- ▲Short-throw: true (vs false).
Spec comparison
Image
| Spec | BenQ - X3100i | Optoma - UHZ65UST |
|---|---|---|
| Resolutionⓘ | 4K | 4K |
| Brightnessⓘ | 3300 lm | 3500 lmlead |
| Contrast | 600000:1 | 2500000:1 |
| Light source | LED | Laserlead |
| Short-throw | false | truelead |
Smart & Connectivity
| Spec | BenQ - X3100i | Optoma - UHZ65UST |
|---|---|---|
| Smart OS | Android TV | None |
| HDMI inputs | 2 | 3lead |
| Built-in speakers | true | true |