Garmin - Fenix 8 Solar (47mm) vs Garmin - Forerunner 265
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - Fenix 8 Solar (47mm) | Garmin - Forerunner 265 |
|---|---|---|
| GPS mode | 104 h | 24 h |
| Smartwatch mode | 28 days | 13 days |
| Solar charging | true | false |
| ECG | true | false |
Between the Fenix 8 Solar (47mm) and Forerunner 265, the Fenix 8 Solar (47mm) comes out ahead in gps mode / smartwatch mode, while the Forerunner 265 wins on several specs. Overall, the Fenix 8 Solar (47mm) scores 73.5 and the Forerunner 265 scores 69.5 on our Mars Score.
Which should you buy?
The Fenix 8 Solar (47mm) edges ahead on the Mars Score (73.5 vs 69.5), but the 4.0-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Fenix 8 Solar (47mm) if you care most about gps mode / smartwatch mode. The biggest gaps in its favor are gps mode, smartwatch mode, solar charging, among others. The single most decisive one: GPS mode — 333.33% more. 104 h vs 24 h.
The Forerunner 265 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, 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 Solar (47mm) or Garmin - Forerunner 265?
Garmin - Fenix 8 Solar (47mm) leads the current Mars Score by 4.0 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 Garmin - Fenix 8 Solar (47mm) if…
Garmin - Fenix 8 Solar (47mm) has the measurable edge on battery gps hours, battery smartwatch days, has solar.
Choose Garmin - Forerunner 265 if…
Garmin - Forerunner 265 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 Solar (47mm) wins
- ▲GPS mode — 333.33% more. 104 h vs 24 h.
- ▲Smartwatch mode — 115.38% more. 28 days vs 13 days.
- ▲Has Solar charging.
- ▲Has ECG.
Why Garmin - Forerunner 265 wins
- No decisive advantages.
Spec comparison
GPS & Sensors
| Spec | Garmin - Fenix 8 Solar (47mm) | Garmin - Forerunner 265 |
|---|---|---|
| Multi-band GPS | true | true |
| Barometric altimeter | truelead | false |
| Heart rate | true | true |
| ECG | truelead | false |
| Pulse Ox | true | true |
Battery
| Spec | Garmin - Fenix 8 Solar (47mm) | Garmin - Forerunner 265 |
|---|---|---|
| Smartwatch mode | 28 dayslead | 13 days |
| GPS mode | 104 hlead | 24 h |
| Solar charging | truelead | false |
Design
| Spec | Garmin - Fenix 8 Solar (47mm) | Garmin - Forerunner 265 |
|---|---|---|
| Case size | 47 mmlead | 46 mm |
| Weight | 82 g | 47 glead |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |