Done it all, body shop, service, and parts. I'm in parts still, if you can avoid getting into automotive do it. If it's what ya want to do, go heavy line, ****** or diesel. It seems like a steadier flow of work.
I'm negative because I wasted my time getting a bachelors degree and got stuck in this field with no opportunity to move up.
Corporate opportunities seem to be decent if you ever get the option.
Dealerships vary so giving you experience on that would be tricky, they're a separate entity I've worked for good dealers and terrible dealers.