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I got the Epix, it definitely is a posh Fenix. Oled screen is very nice, compared to the Fenix 6 sapphire ti I had before.
I have found that the rubber straps get a bit smelly and trapped sweat, which caused skin irritation, along with not having quite the right tension for accurate HR measurements (for me anyway)
I tried an Amazon chinese velcro strap clone (Enduro 2 style strap but in 22mm). Huge improvement, doesn't stay damp, or cause skin irritation like the standard strap. My ideal fit must have been between 2 of the rubber strap holes.
seems like 'routable mapping' is the term for Garmin
https://www.garmin.com/en-GB/c/sports-fitness/running-smartwatches/?FILTER_FEATURE_SUBTRACKING_MAPPING=routable_map
I've got the Fenix 6 Pro and loading a GPX on is pretty straightforward. It'll show the route on the map and then beep or buzz when I'm approaching a turn so I don't miss it.
Forerunner 945 is basically the Fenix 6 Pro series in its triathlon variant
Forerunner 955 is Fenix 7
Epix is posh Fenix with AMOLED screen
(things like Forerunner 745 does breadcrumb trails, but not overlaid on a map)