Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | BenQ - PD3225U | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| Peak brightness | 400 nits | 600 nits |
| Screen size | 31.5 " | 27 " |
| DCI-P3 coverage | 98 % | 99 % |
Between the PD3225U and ViewFinity S9 (S90PC), the PD3225U comes out ahead in screen size, while the ViewFinity S9 (S90PC) wins on peak brightness / dci-p3 coverage. Overall, the PD3225U scores 64.8 and the ViewFinity S9 (S90PC) scores 65.9 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (64.8 vs 65.9). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the PD3225U if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are screen size. The single most decisive one: Screen size — 16.67% more. 31.5 " vs 27 ".
Pick the ViewFinity S9 (S90PC) if you care most about peak brightness / dci-p3 coverage. Its strongest claims are peak brightness, dci-p3 coverage. The single most decisive one: Peak brightness — 50.00% more. 600 nits vs 400 nits.
Both ship with comparable refresh rate, response time (gtg), panel type, 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 - PD3225U or Samsung - ViewFinity S9 (S90PC)?
Samsung - ViewFinity S9 (S90PC) leads the current Mars Score by 1.1 points.The more useful decision is the trade-off behind that result: compare screen size against the way you will actually use the product.
Choose BenQ - PD3225U if…
BenQ - PD3225U has the measurable edge on screen size in.
Choose Samsung - ViewFinity S9 (S90PC) if…
Samsung - ViewFinity S9 (S90PC) has the measurable edge on peak brightness nits, color gamut dci p3 pct.
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 - PD3225U wins
- ▲Screen size — 16.67% more. 31.5 " vs 27 ".
Why Samsung - ViewFinity S9 (S90PC) wins
- ▲Peak brightness — 50.00% more. 600 nits vs 400 nits.
- ▲DCI-P3 coverage — 1.02% more. 99 % vs 98 %.
Spec comparison
Panel
| Spec | BenQ - PD3225U | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| Screen size | 31.5 "lead | 27 " |
| Panel typeⓘ | IPS | IPS |
| Resolutionⓘ | 4K | 5Klead |
| Aspect ratioⓘ | 16:9 | 16:9 |
| Curvedⓘ | false | false |
Performance
| Spec | BenQ - PD3225U | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| Refresh rateⓘ | 60 Hz | 60 Hz |
| Response time (GtG)ⓘ | 5 ms | 5 ms |
| Peak brightnessⓘ | 400 nits | 600 nitslead |
| DCI-P3 coverageⓘ | 98 % | 99 %lead |
| HDRⓘ | true | true |
| G-Syncⓘ | false | false |
| FreeSyncⓘ | false | false |
Connectivity
| Spec | BenQ - PD3225U | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| HDMI ports | 1 | 1 |
| DisplayPort ports | 1lead | 0 |
| USB-C inputⓘ | true | true |
| USB-C Power Deliveryⓘ | 90 W | 90 W |
| KVM | truelead | false |
Frequently asked
Which has higher refresh rate, PD3225U or ViewFinity S9 (S90PC)?+
ViewFinity S9 (S90PC) refreshes at 60Hz vs 60Hz.
Which has faster response time, PD3225U or ViewFinity S9 (S90PC)?+
ViewFinity S9 (S90PC) responds in 5ms vs 5ms.
Does PD3225U or ViewFinity S9 (S90PC) have USB-C with power delivery?+
Both offer USB-C PD — 90W on PD3225U, 90W on ViewFinity S9 (S90PC).