Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | BenQ - TK860i | Optoma - UHD35STx |
|---|---|---|
| Brightness | 3300 lm | 3600 lm |
| Short-throw | false | true |
Between the TK860i and UHD35STx, the TK860i comes out ahead in several specs, while the UHD35STx wins on brightness / short-throw. Overall, the TK860i scores 76.6 and the UHD35STx scores 78.9 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.6 vs 78.9). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
The TK860i 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 UHD35STx if you care most about brightness / short-throw. Its strongest claims are brightness, short-throw. The single most decisive one: Brightness — 9.09% more. 3600 lm vs 3300 lm.
Both ship with comparable resolution, light source, 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 - TK860i or Optoma - UHD35STx?
Optoma - UHD35STx leads the current Mars Score by 2.3 points.The more useful decision is the trade-off behind that result: compare brightness, short-throw against the way you will actually use the product.
Choose BenQ - TK860i if…
BenQ - TK860i 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 - UHD35STx if…
Optoma - UHD35STx has the measurable edge on brightness lumens, 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 - TK860i wins
- No decisive advantages.
Why Optoma - UHD35STx wins
- ▲Brightness — 9.09% more. 3600 lm vs 3300 lm.
- ▲Short-throw: true (vs false).
Spec comparison
Image
| Spec | BenQ - TK860i | Optoma - UHD35STx |
|---|---|---|
| Resolutionⓘ | 4K | 4K |
| Brightnessⓘ | 3300 lm | 3600 lmlead |
| Contrast | 600000:1 | 1000000:1 |
| Light source | Lamp | Lamp |
| Short-throw | false | truelead |
Smart & Connectivity
| Spec | BenQ - TK860i | Optoma - UHD35STx |
|---|---|---|
| Smart OS | Android TV | None |
| HDMI inputs | 2 | 2 |
| Built-in speakers | true | true |