Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - Enduro 3 | Polar - Grit X2 Pro |
|---|---|---|
| GPS mode | 320 h | 43 h |
| Smartwatch mode | 36 days | 10 days |
| Solar charging | true | false |
| ECG | false | true |
Between the Enduro 3 and Grit X2 Pro, the Enduro 3 comes out ahead in gps mode / smartwatch mode, while the Grit X2 Pro wins on ecg. Overall, the Enduro 3 scores 82.6 and the Grit X2 Pro scores 68.3 on our Mars Score.
Which should you buy?
The Enduro 3 is the clear pick on raw spec strength, leading by 14.3 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 Enduro 3 if you care most about gps mode / smartwatch mode. The biggest gaps in its favor are gps mode, smartwatch mode, solar charging. The single most decisive one: GPS mode — 644.19% more. 320 h vs 43 h.
Pick the Grit X2 Pro if you care most about ecg. Its strongest claims are ecg. The single most decisive one: Has ECG.
Both ship with comparable multi-band gps, so those specs do not separate the two — focus on the differences below.
Bottom line: the Enduro 3 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 - Enduro 3 or Polar - Grit X2 Pro?
Garmin - Enduro 3 leads the current Mars Score by 14.3 points.The more useful decision is the trade-off behind that result: compare smartwatch mode, gps mode against the way you will actually use the product.
Choose Garmin - Enduro 3 if…
Garmin - Enduro 3 has the measurable edge on battery gps hours, battery smartwatch days, has solar.
Choose Polar - Grit X2 Pro if…
Polar - Grit X2 Pro has the measurable edge on has ecg.
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 - Enduro 3 wins
- ▲GPS mode — 644.19% more. 320 h vs 43 h.
- ▲Smartwatch mode — 260.00% more. 36 days vs 10 days.
- ▲Has Solar charging.
Why Polar - Grit X2 Pro wins
- ▲Has ECG.
Spec comparison
GPS & Sensors
| Spec | Garmin - Enduro 3 | Polar - Grit X2 Pro |
|---|---|---|
| Multi-band GPS | true | true |
| Barometric altimeter | true | true |
| Heart rate | true | true |
| ECG | false | truelead |
| Pulse Ox | true | true |
Battery
| Spec | Garmin - Enduro 3 | Polar - Grit X2 Pro |
|---|---|---|
| Smartwatch mode | 36 dayslead | 10 days |
| GPS mode | 320 hlead | 43 h |
| Solar charging | truelead | false |
Design
| Spec | Garmin - Enduro 3 | Polar - Grit X2 Pro |
|---|---|---|
| Case size | 51 mmlead | 47.5 mm |
| Weight | 63 glead | 79 g |
| Water resistanceⓘ | 10 ATM | 10 ATM |