My 2 thoughts.
1. If you do NOT feel as though you will be getting into potentially dangerous situations, or if you do NOT need to "check in" with the family, then stick with OnX. You are always going to have your phone with you (for camera purposes). The only thing I would ADD is an external charging unit so that you don't need to worry about battery life (or you could go solar but I don't trust those things).
2. If you feel the need, as I do, to check in with the family and to potentially send for help/SOS, the InReach is a great unit. Earthmate is a very user friendly website for downloading maps to your phone. Your phone syncs with the GPS as long as you do it while still in service. The InReach has come pretty impressive battery life (so if your phone dies, you always have the gps functions available to get out of dodge). Pairing the InReach up with your phone is MUCH easier to use than just the buttons on a standard gps. Also much better map viewing when looking for that timbered bench that might be an elk bedding area.