Amazfit - Helio Ring vs Coros - PACE 3 (as fitness tracker)

The PACE 3 (as fitness tracker) is the clear pick on raw spec strength, leading by 25.1 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 Helio Ring if you care most about water resistance. The biggest gaps in its favor are water resistance.

Pick the PACE 3 (as fitness tracker) if you care most about battery life and sport modes. Its strongest claims are battery life, sport modes, gps.

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.