Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coros - Apex 2 | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| GPS mode | 45 h | 104 h |
| Smartwatch mode | 17 days | 28 days |
| Multi-band GPS | false | true |
| Solar charging | false | true |
| ECG | false | true |
Between the Apex 2 and Fenix 8 Solar (47mm), the Apex 2 comes out ahead in several specs, while the Fenix 8 Solar (47mm) wins on gps mode / smartwatch mode. Overall, the Apex 2 scores 46.1 and the Fenix 8 Solar (47mm) scores 73.5 on our Mars Score.
Which should you buy?
The Fenix 8 Solar (47mm) is the clear pick on raw spec strength, leading by 27.4 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.
The Apex 2 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the Fenix 8 Solar (47mm) if you care most about gps mode / smartwatch mode. Its strongest claims are gps mode, smartwatch mode, multi-band gps, among others. The single most decisive one: GPS mode — 131.11% more. 104 h vs 45 h.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: the Fenix 8 Solar (47mm) 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: Coros - Apex 2 or Garmin - Fenix 8 Solar (47mm)?
Garmin - Fenix 8 Solar (47mm) leads the current Mars Score by 27.4 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 Coros - Apex 2 if…
Coros - Apex 2 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Garmin - Fenix 8 Solar (47mm) if…
Garmin - Fenix 8 Solar (47mm) has the measurable edge on battery gps hours, battery smartwatch days, has multiband gps.
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 Coros - Apex 2 wins
- No decisive advantages.
Why Garmin - Fenix 8 Solar (47mm) wins
- ▲GPS mode — 131.11% more. 104 h vs 45 h.
- ▲Smartwatch mode — 64.71% more. 28 days vs 17 days.
- ▲Has Multi-band GPS.
- ▲Has Solar charging.
- ▲Has ECG.
Spec comparison
GPS & Sensors
| Spec | Coros - Apex 2 | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| Multi-band GPS | false | truelead |
| Barometric altimeter | true | true |
| Heart rate | true | true |
| ECG | false | truelead |
| Pulse Ox | true | true |
Battery
| Spec | Coros - Apex 2 | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| Smartwatch mode | 17 days | 28 dayslead |
| GPS mode | 45 h | 104 hlead |
| Solar charging | false | truelead |
Design
| Spec | Coros - Apex 2 | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| Case size | 43 mm | 47 mmlead |
| Weight | 53 glead | 82 g |
| Water resistanceⓘ | 5 ATM | 10 ATMlead |