The Grand Canyon is one of the Seven Wonders of the Natural World, so expect a lot of traffic. The South Rim provides more infrastructure for access, which in turn brings more traffic, which in turn brings more infrastructure, etc. If you don't mind a crowd and prefer easier access, then go to the South Rim. If you like more solitude and don't mind driving your toad for some distance from an RV parking space for your big rig, then go to the North Rim. In the end, as Doug indicated, both North and South Rims are worth the visit.