-the possibility to have as many wheels as you’d like.
-Wheels collision are round instead of line trace so it look much better.
-It is ALOT easier to setup.
-It is very rewarding to do my own vehicle class from the pawn class instead of using the wheeled vehicle class 
-Having built that system myself, I know exactly how everything is done and why it’s done like that.
-Having a custom class like that made only in blueprint allow blueprint users to customize it so much more than starting from a c++ class like the wheeled vehicle class.
that’s pretty much all