Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - Fenix 8 CE (47mm) | Polar - Grit X2 Pro |
|---|---|---|
| GPS mode | 84 h | 43 h |
| Smartwatch mode | 16 days | 10 days |
Between the Fenix 8 CE (47mm) and Grit X2 Pro, the Fenix 8 CE (47mm) comes out ahead in gps mode / smartwatch mode, while the Grit X2 Pro wins on several specs. Overall, the Fenix 8 CE (47mm) scores 70.6 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 (70.6 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 Fenix 8 CE (47mm) 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 — 95.35% more. 84 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 - Fenix 8 CE (47mm) or Polar - Grit X2 Pro?
Garmin - Fenix 8 CE (47mm) 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 Garmin - Fenix 8 CE (47mm) if…
Garmin - Fenix 8 CE (47mm) 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 - Fenix 8 CE (47mm) wins
- ▲GPS mode — 95.35% more. 84 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 - Fenix 8 CE (47mm) | 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 - Fenix 8 CE (47mm) | Polar - Grit X2 Pro |
|---|---|---|
| Smartwatch mode | 16 dayslead | 10 days |
| GPS mode | 84 hlead | 43 h |
| Solar charging | false | false |
Design
| Spec | Garmin - Fenix 8 CE (47mm) | Polar - Grit X2 Pro |
|---|---|---|
| Case size | 47 mm | 47.5 mmlead |
| Weight | 80 g | 79 glead |
| Water resistanceⓘ | 10 ATM | 10 ATM |