Trying to figure out a solution to these same problems without having to have both apps.
BaseMap seems to have a slight edge in overall features of the maps, mostly considering the price for Pro that includes all states and the 3D GE-type feature.
OnX has a giant edge in being able to download to my Rino GPS.
A hidden, but maybe the biggest advantage for me personally and especially my wife, additional feature of OnX is the water layer with offshore charts.
Happy wife, happy spending money on tech toys.
The water layer is probably just me, but am I missing an ability/shortcut to download a complete map to a GPS via file or card with BaseMap? (Of note - I do not have Pro yet, I’m just trying out the free version alongside the 7 day OnX trial.)