ASUS - ROG Phone 9 Pro vs Xiaomi 15 Ultra

The ROG Phone 9 Pro edges ahead on the Mars Score (77.7 vs 73.8), but the 3.9-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the ROG Phone 9 Pro 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 refresh rate, ram, weight, among others.

Pick the Xiaomi 15 Ultra 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 wireless charging, wired charging, pixel density, among others.

Both ship with comparable main camera, 5g support, water resistance, 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.