Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coros - Apex 2 | Garmin - Instinct 3 Tactical |
|---|---|---|
| Smartwatch mode | 17 days | 30 days |
| GPS mode | 45 h | 70 h |
| Solar charging | false | true |
Between the Apex 2 and Instinct 3 Tactical, the Apex 2 comes out ahead in several specs, while the Instinct 3 Tactical wins on smartwatch mode / gps mode. Overall, the Apex 2 scores 46.1 and the Instinct 3 Tactical scores 50.3 on our Mars Score.
Which should you buy?
The Instinct 3 Tactical edges ahead on the Mars Score (46.1 vs 50.3), but the 4.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
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 Instinct 3 Tactical if you care most about smartwatch mode / gps mode. Its strongest claims are smartwatch mode, gps mode, solar charging. The single most decisive one: Smartwatch mode — 76.47% more. 30 days vs 17 days.
Both ship with comparable multi-band gps, 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: Coros - Apex 2 or Garmin - Instinct 3 Tactical?
Garmin - Instinct 3 Tactical leads the current Mars Score by 4.2 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 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 - Instinct 3 Tactical if…
Garmin - Instinct 3 Tactical has the measurable edge on battery smartwatch days, battery gps hours, has solar.
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 - Instinct 3 Tactical wins
- ▲Smartwatch mode — 76.47% more. 30 days vs 17 days.
- ▲GPS mode — 55.56% more. 70 h vs 45 h.
- ▲Has Solar charging.
Spec comparison
GPS & Sensors
| Spec | Coros - Apex 2 | Garmin - Instinct 3 Tactical |
|---|---|---|
| Multi-band GPS | false | false |
| Barometric altimeter | true | true |
| Heart rate | true | true |
| ECG | false | false |
| Pulse Ox | true | true |
Battery
| Spec | Coros - Apex 2 | Garmin - Instinct 3 Tactical |
|---|---|---|
| Smartwatch mode | 17 days | 30 dayslead |
| GPS mode | 45 h | 70 hlead |
| Solar charging | false | truelead |
Design
| Spec | Coros - Apex 2 | Garmin - Instinct 3 Tactical |
|---|---|---|
| Case size | 43 mm | 50 mmlead |
| Weight | 53 glead | 70 g |
| Water resistanceⓘ | 5 ATM | 10 ATMlead |