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The saphire face on the Fenix 6 pro is probably worth it if the watch is set for a rough life.
I always get a gorilla glass screen protector for the watch anyway. It's saved the face of my old 935 several times and I bumped my 945 on a lamp post the other week and there's a huge scratch in the protective glass (must order another to replace it).
Even if I got something like a Fenix 6 Pro I'd still put a protective screen on it.
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.