Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Polar - Grit X2 Pro | Suunto - Race |
|---|---|---|
| GPS mode | 43 h | 120 h |
| Smartwatch mode | 10 days | 12 days |
| ECG | true | false |
Between the Grit X2 Pro and Race, the Grit X2 Pro comes out ahead in ecg, while the Race wins on gps mode / smartwatch mode. Overall, the Grit X2 Pro scores 68.3 and the Race scores 70.6 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (68.3 vs 70.6). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Grit X2 Pro if you care most about ecg. The biggest gaps in its favor are ecg. The single most decisive one: Has ECG.
Pick the Race if you care most about gps mode / smartwatch mode. Its strongest claims are gps mode, smartwatch mode. The single most decisive one: GPS mode — 179.07% more. 120 h vs 43 h.
Both ship with comparable multi-band gps, solar charging, 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.
Which should you buy: Polar - Grit X2 Pro or Suunto - Race?
Suunto - Race leads the current Mars Score by 2.3 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 Polar - Grit X2 Pro if…
Polar - Grit X2 Pro has the measurable edge on has ecg.
Choose Suunto - Race if…
Suunto - Race has the measurable edge on battery gps hours, battery smartwatch days.
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 Polar - Grit X2 Pro wins
- ▲Has ECG.
Why Suunto - Race wins
- ▲GPS mode — 179.07% more. 120 h vs 43 h.
- ▲Smartwatch mode — 20.00% more. 12 days vs 10 days.
Spec comparison
GPS & Sensors
| Spec | Polar - Grit X2 Pro | Suunto - Race |
|---|---|---|
| Multi-band GPS | true | true |
| Barometric altimeter | true | true |
| Heart rate | true | true |
| ECG | truelead | false |
| Pulse Ox | true | true |
Battery
| Spec | Polar - Grit X2 Pro | Suunto - Race |
|---|---|---|
| Smartwatch mode | 10 days | 12 dayslead |
| GPS mode | 43 h | 120 hlead |
| Solar charging | false | false |
Design
| Spec | Polar - Grit X2 Pro | Suunto - Race |
|---|---|---|
| Case size | 47.5 mm | 49 mmlead |
| Weight | 79 glead | 83 g |
| Water resistanceⓘ | 10 ATM | 10 ATM |