I can’t say about the difference between a 32’ and 40’. But everything’s a compromise with RV’s. Big is nice parked, but the tradeoff is maneuverability and places you can go and where you can camp. 40’ will likely exclude you from national forest cg’s and the state parks I’m familiar with. Even 32’ will be iffy with nf cg’s, you won’t get far from the pavement and it will be difficult to maneuver the roads through them. So where you want to camp is a critical consideration in choosing size. In those sizes you’re probably looking more at commercial cg’s than public land camping and advance reservations may be a good idea if you want to be assured of finding a campsite.
