Google - Inspire 3 vs Oura - Ring 4

These two are nearly even on the Mars Score (66.4 vs 63.8). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.

Pick the Inspire 3 if you care most about battery life. The biggest gaps in its favor are battery life. The single most decisive one: Battery life — 25.00% more. 10 days vs 8 days.

Pick the Ring 4 if you care most about sport modes / water resistance. Its strongest claims are sport modes, water resistance. The single most decisive one: Sport modes — 19.00 more. 40 vs 21.

Both ship with comparable gps, spo2, so those specs do not 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 says both are well-rounded; the differences are about trade-offs, not quality.