Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - epix Pro (Gen 2) | Polar - Grit X2 Pro |
|---|---|---|
| GPS mode | 82 h | 43 h |
| Smartwatch mode | 16 days | 10 days |
Between the epix Pro (Gen 2) and Grit X2 Pro, the epix Pro (Gen 2) comes out ahead in gps mode / smartwatch mode, while the Grit X2 Pro wins on several specs. Overall, the epix Pro (Gen 2) scores 70.9 and the Grit X2 Pro scores 68.3 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (70.9 vs 68.3). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the epix Pro (Gen 2) if you care most about gps mode / smartwatch mode. The biggest gaps in its favor are gps mode, smartwatch mode. The single most decisive one: GPS mode — 90.70% more. 82 h vs 43 h.
The Grit X2 Pro similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable multi-band gps, solar charging, ecg, 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: Garmin - epix Pro (Gen 2) or Polar - Grit X2 Pro?
Garmin - epix Pro (Gen 2) leads the current Mars Score by 2.6 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 - epix Pro (Gen 2) if…
Garmin - epix Pro (Gen 2) has the measurable edge on battery gps hours, battery smartwatch days.
Choose Polar - Grit X2 Pro if…
Polar - Grit X2 Pro does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
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 - epix Pro (Gen 2) wins
- ▲GPS mode — 90.70% more. 82 h vs 43 h.
- ▲Smartwatch mode — 60.00% more. 16 days vs 10 days.
Why Polar - Grit X2 Pro wins
- No decisive advantages.
Spec comparison
GPS & Sensors
| Spec | Garmin - epix Pro (Gen 2) | Polar - Grit X2 Pro |
|---|---|---|
| Multi-band GPS | true | true |
| Barometric altimeter | true | true |
| Heart rate | true | true |
| ECG | true | true |
| Pulse Ox | true | true |
Battery
| Spec | Garmin - epix Pro (Gen 2) | Polar - Grit X2 Pro |
|---|---|---|
| Smartwatch mode | 16 dayslead | 10 days |
| GPS mode | 82 hlead | 43 h |
| Solar charging | false | false |
Design
| Spec | Garmin - epix Pro (Gen 2) | Polar - Grit X2 Pro |
|---|---|---|
| Case size | 47 mm | 47.5 mmlead |
| Weight | 76 glead | 79 g |
| Water resistanceⓘ | 10 ATM | 10 ATM |