Between the Lily 2 and Ring 4, the Lily 2 comes out ahead in several specs, while the Ring 4 wins on battery life and sport modes. Overall, the Lily 2 scores 46.1 and the Ring 4 scores 52.9 on our Mars Score.
Which should you buy?
The Ring 4 edges ahead on the Mars Score (46.1 vs 52.9), but the 6.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The Lily 2 doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the Ring 4 if you care most about battery life and sport modes. Its strongest claims are battery life, sport modes, water resistance.
Both ship with comparable gps, spo2, so those specs don't separate the two — focus on the differences below.
Bottom line: the Ring 4 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Garmin - Lily 2 wins
- No decisive advantages.
Why Oura - Ring 4 wins
- ▲Battery life — 60.00% more. 8 days vs 5 days.
- ▲Sport modes — 20.00 more. 40 vs 20.
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Spec comparison
Fitness
| Spec | Garmin - Lily 2 | Oura - Ring 4 |
|---|---|---|
| GPS | false | false |
| Heart rate | true | true |
| SpO2 | true | true |
| Sleep tracking | true | true |
| Sport modes | 20 | 40lead |
Battery
| Spec | Garmin - Lily 2 | Oura - Ring 4 |
|---|---|---|
| Battery life | 5 days | 8 dayslead |
| Water resistanceⓘ | 5 ATM | 10 ATMlead |
Design
| Spec | Garmin - Lily 2 | Oura - Ring 4 |
|---|---|---|
| Display size | 1.0 "lead | 0 " |
| Weight | 21 g | 3.3 glead |
Frequently asked
Spec-level deep dives
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