Coros - PACE 3 vs Polar - Grit X2 Pro

The PACE 3 edges ahead on the Mars Score (46.6 vs 42.6), but the 4.0-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the PACE 3 if you care most about smartwatch mode. The biggest gaps in its favor are smartwatch mode.

Pick the Grit X2 Pro if you care most about gps mode and ecg. Its strongest claims are gps mode, ecg.

Both ship with comparable multi-band gps, solar charging, 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.