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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.
Fenix 6 Pro or Forerunner 945?