Basically, rock says "do whatever the f*ck you want".
you wanna get a new piercing?- cool,
you wanna come out of the closet?- whatever, just don't hit on me,
wanna do some crazy stunt or wild ****?- more power to ya.

In rap, much more often, though, you're outcast for being a little different.

Rock is freedom. Freedom to express and break away from the restraints of society.

Rap is freedom. Freedom to skite about how much of a respect you own. Its arrogance.

.........I pick rock. No contest really.