Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coros - VERTIX 2S | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| Smartwatch mode | 42 days | 28 days |
| GPS mode | 118 h | 104 h |
| ECG | false | true |
Between the VERTIX 2S and Fenix 8 Solar (47mm), the VERTIX 2S comes out ahead in smartwatch mode / gps mode, while the Fenix 8 Solar (47mm) wins on ecg. Overall, the VERTIX 2S scores 76.5 and the Fenix 8 Solar (47mm) scores 73.5 on our Mars Score.
Which should you buy?
The VERTIX 2S edges ahead on the Mars Score (76.5 vs 73.5), but the 3.0-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the VERTIX 2S if you care most about smartwatch mode / gps mode. The biggest gaps in its favor are smartwatch mode, gps mode. The single most decisive one: Smartwatch mode — 50.00% more. 42 days vs 28 days.
Pick the Fenix 8 Solar (47mm) if you care most about ecg. Its strongest claims are ecg. The single most decisive one: Has ECG.
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: Coros - VERTIX 2S or Garmin - Fenix 8 Solar (47mm)?
Coros - VERTIX 2S leads the current Mars Score by 3.0 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 - VERTIX 2S if…
Coros - VERTIX 2S has the measurable edge on battery smartwatch days, battery gps hours.
Choose Garmin - Fenix 8 Solar (47mm) if…
Garmin - Fenix 8 Solar (47mm) has the measurable edge on has ecg.
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 - VERTIX 2S wins
- ▲Smartwatch mode — 50.00% more. 42 days vs 28 days.
- ▲GPS mode — 13.46% more. 118 h vs 104 h.
Why Garmin - Fenix 8 Solar (47mm) wins
- ▲Has ECG.
Spec comparison
GPS & Sensors
| Spec | Coros - VERTIX 2S | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| Multi-band GPS | true | true |
| Barometric altimeter | true | true |
| Heart rate | true | true |
| ECG | false | truelead |
| Pulse Ox | true | true |
Battery
| Spec | Coros - VERTIX 2S | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| Smartwatch mode | 42 dayslead | 28 days |
| GPS mode | 118 hlead | 104 h |
| Solar charging | true | true |
Design
| Spec | Coros - VERTIX 2S | Garmin - Fenix 8 Solar (47mm) |
|---|---|---|
| Case size | 50.3 mmlead | 47 mm |
| Weight | 84 g | 82 glead |
| Water resistanceⓘ | 10 ATM | 10 ATM |