HP - Z27k G3 4K USB-C vs Samsung - ViewFinity S9 (S90PC)

These two are nearly even on the Mars Score (59 vs 59.3). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.

Pick the Z27k G3 4K USB-C if you care most about usb-c power delivery. The biggest gaps in its favor are usb-c power delivery.

Pick the ViewFinity S9 (S90PC) if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are peak brightness, dci-p3 coverage.

Both ship with comparable refresh rate, response time (gtg), screen size, 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.