GPS tech (Garmin, Hammerhead, Wahoo, RWGPS, etc)

If you are going to take it out "adventuring" then Fenix 6, if not then 945. The Fenix is stainless steel where the 945 is plastic, so feels quite a lot heavier and will take more of a beating.

The saphire face on the Fenix 6 is probably worth it if the watch is set for a rough life.