For me, the best maps are "HERE". Based on my experience in metropolitan France on my URVOLAX Carplay and Samsung S21 devices since the beginning of this year (IGO nextgen installed with help of the GPS Power forum), and in the past, based on my experience as a simple user on "ready to use" commercial GPS (on several Navgear devices, HERE map updates purchased on navgear.naviextras.com). I've also tried other maps on other GPS devices, with different screen types, but I didn't like them as much as "HERE" maps.
Other users of my car also share my opinion.