Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - MARQ Athlete (Gen 2) | Polar - Grit X2 Pro |
|---|---|---|
| Smartwatch mode | 16 days | 10 days |
| GPS mode | 30 h | 43 h |
Between the MARQ Athlete (Gen 2) and Grit X2 Pro, the MARQ Athlete (Gen 2) comes out ahead in smartwatch mode, while the Grit X2 Pro wins on gps mode. Overall, the MARQ Athlete (Gen 2) scores 68.1 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 (68.1 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 MARQ Athlete (Gen 2) if you care most about smartwatch mode. The biggest gaps in its favor are smartwatch mode. The single most decisive one: Smartwatch mode — 60.00% more. 16 days vs 10 days.
Pick the Grit X2 Pro if you care most about gps mode. Its strongest claims are gps mode. The single most decisive one: GPS mode — 43.33% more. 43 h vs 30 h.
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 - MARQ Athlete (Gen 2) or Polar - Grit X2 Pro?
Polar - Grit X2 Pro leads the current Mars Score by 0.2 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 - MARQ Athlete (Gen 2) if…
Garmin - MARQ Athlete (Gen 2) has the measurable edge on battery smartwatch days.
Choose Polar - Grit X2 Pro if…
Polar - Grit X2 Pro has the measurable edge on battery gps hours.
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 - MARQ Athlete (Gen 2) wins
- ▲Smartwatch mode — 60.00% more. 16 days vs 10 days.
Why Polar - Grit X2 Pro wins
- ▲GPS mode — 43.33% more. 43 h vs 30 h.
Spec comparison
GPS & Sensors
| Spec | Garmin - MARQ Athlete (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 - MARQ Athlete (Gen 2) | Polar - Grit X2 Pro |
|---|---|---|
| Smartwatch mode | 16 dayslead | 10 days |
| GPS mode | 30 h | 43 hlead |
| Solar charging | false | false |
Design
| Spec | Garmin - MARQ Athlete (Gen 2) | Polar - Grit X2 Pro |
|---|---|---|
| Case size | 46 mm | 47.5 mmlead |
| Weight | 92 g | 79 glead |
| Water resistanceⓘ | 10 ATM | 10 ATM |