Fenix 3 looks better, it's obviously smaller and probably more comfortable. And I'm saying all of this with an Ambit 3 Peak Sapphire on my wrist.
I'm was just browsing (again) Garmin forum and the number of problems people have there is astonishing for a 450-550 euros device. It looks like they are beta testers for Garmin on their own money. I really, really hope that Garmin fixes those issues for all those people and for raising the bar for Ambit 4.
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