Between the Helio Ring and Smart Band 9, the Helio Ring comes out ahead in water resistance, while the Smart Band 9 wins on battery life and sport modes. Overall, the Helio Ring scores 46.1 and the Smart Band 9 scores 78.8 on our Mars Score.
Which should you buy?
The Smart Band 9 is the clear pick on raw spec strength, leading by 32.7 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 Smart Band 9 if you care most about battery life and sport modes. Its strongest claims are battery life, sport modes.
Both ship with comparable gps, spo2, so those specs don't separate the two — focus on the differences below.
Bottom line: the Smart Band 9 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Amazfit - Helio Ring wins
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Why Xiaomi - Smart Band 9 wins
- ▲Battery life — 320.00% more. 21 days vs 5 days.
- ▲Sport modes — 150.00 more. 150 vs 0.
Spec comparison
Fitness
| Spec | Amazfit - Helio Ring | Xiaomi - Smart Band 9 |
|---|---|---|
| GPS | false | false |
| Heart rate | true | true |
| SpO2 | true | true |
| Sleep tracking | true | true |
| Sport modes | 0 | 150lead |
Battery
| Spec | Amazfit - Helio Ring | Xiaomi - Smart Band 9 |
|---|---|---|
| Battery life | 5 days | 21 dayslead |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Design
| Spec | Amazfit - Helio Ring | Xiaomi - Smart Band 9 |
|---|---|---|
| Display size | 0 " | 1.62 "lead |
| Weight | 3.5 glead | 16 g |
Spec-level deep dives
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