vault 3 ^^NO. That would be fiends. Seriously people actually know the game before you answer questions. For peaceful super mutants, it is Jacobstown. For ones to fight, it would be Black Mountain.
- If you resolve Crazy, Crazy, Crazy peacefully, the Black Mountain mutants might turn nonhostile. This makes it easier to pick them off with a sniper weapon.
You might also check the Jack Rabbit Springs - there are some Muties sown there.