Thanks to a friend who has a
Garmin shop, today I am back with
Garmin fēnix 7, but this time, I am going to test the "
7X Sapphire Solar Edition".
It's expensive, very very expensive (999.99 USD), but it has
- 32GB of flash, so you can upload more GPS maps (very useful for my plans)
- the case is made of fiber-reinforced polymer with titanium rear cover
- lens are made of "Power Sapphire", which is more robust than "Gorilla Glass"
- it adds a Led Flash, really useful for me in the dark
- up to
***30 days*** in Solar Battery Saver Watch Mode with the GPS in low precision mode
The last point is the killer one!!! The
Sapphire is better than every other
Fenix 7 Editions I currently have a -40% discount, so I am really really tempted to buy it. We will see 
--- edit: ---
I let it expire, d'oh. Now it's full price. I am on budget and I am really looking for the cheapest model available, so I am also considering the
Amazfit GTR 3, which has in-built GPS and a decent battery life for its price: up to 14 days with the GPS in "low precision mode", and up to 25 days in "Battery Saver mode"!!!
Ok, it doesn't have a large flash, but it's definitively not bad.
I will test one next week, and take a final decision
