What garmin inreach do I get?

I’m headed to the mountains next week, but I still havent figured out which inreach is best for me. i have thought about the messenger and the mini 2. The messenger seems to have what I need, but in case it fogs up, it would be nice to have a gps. Could I use my phone for this if I downloaded the map beforehand? I know how to use a map and compass, but I would prefer having a gps available just in case. Any recommendation?