Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - Lily 2 | Xiaomi - Smart Band 9 |
|---|---|---|
| Battery life | 5 days | 21 days |
| Sport modes | 20 | 150 |
Between the Lily 2 and Smart Band 9, the Lily 2 comes out ahead in several specs, while the Smart Band 9 wins on battery life / sport modes. Overall, the Lily 2 scores 64.2 and the Smart Band 9 scores 75.8 on our Mars Score.
Which should you buy?
The Smart Band 9 is the clear pick on raw spec strength, leading by 11.6 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.
The Lily 2 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the Smart Band 9 if you care most about battery life / sport modes. Its strongest claims are battery life, sport modes. The single most decisive one: Battery life — 320.00% more. 21 days vs 5 days.
Both ship with comparable gps, spo2, water resistance, so those specs do not 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.
Which should you buy: Garmin - Lily 2 or Xiaomi - Smart Band 9?
Xiaomi - Smart Band 9 leads the current Mars Score by 11.6 points.The more useful decision is the trade-off behind that result: compare battery life against the way you will actually use the product.
Choose Garmin - Lily 2 if…
Garmin - Lily 2 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Xiaomi - Smart Band 9 if…
Xiaomi - Smart Band 9 has the measurable edge on battery days, sport modes.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Garmin - Lily 2 wins
- No decisive advantages.
Why Xiaomi - Smart Band 9 wins
- ▲Battery life — 320.00% more. 21 days vs 5 days.
- ▲Sport modes — 130.00 more. 150 vs 20.
Spec comparison
Fitness
| Spec | Garmin - Lily 2 | Xiaomi - Smart Band 9 |
|---|---|---|
| Form factor | Watchlead | Band |
| GPS | false | false |
| Heart rate | true | true |
| SpO2 | true | true |
| Sleep tracking | true | true |
| Sport modes | 20 | 150lead |
Battery
| Spec | Garmin - Lily 2 | Xiaomi - Smart Band 9 |
|---|---|---|
| Battery lifeⓘ | 5 days | 21 dayslead |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Design
| Spec | Garmin - Lily 2 | Xiaomi - Smart Band 9 |
|---|---|---|
| Display size | 1.0 " | 1.62 "lead |
| Weight | 21 g | 16 glead |