Coros - PACE 3 (as fitness tracker) vs Oura - Ring 4

The PACE 3 (as fitness tracker) is the clear pick on raw spec strength, leading by 18.3 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.

Pick the PACE 3 (as fitness tracker) if you care most about battery life and gps. The biggest gaps in its favor are battery life, gps.

Pick the Ring 4 if you care most about sport modes and water resistance. Its strongest claims are sport modes, water resistance.

Both ship with comparable spo2, so those specs don't separate the two — focus on the differences below.

Bottom line: the PACE 3 (as fitness tracker) is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.