Garmin - Fenix 8 Solar (47mm) vs Polar - Grit X2 Pro

The Fenix 8 Solar (47mm) is the clear pick on raw spec strength, leading by 15.8 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 Fenix 8 Solar (47mm) if you care most about smartwatch mode / gps mode. The biggest gaps in its favor are smartwatch mode, gps mode, solar charging.

The Grit X2 Pro similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.

Both ship with comparable multi-band gps, ecg, so those specs do not separate the two — focus on the differences below.

Bottom line: the Fenix 8 Solar (47mm) is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.