well, yeah arms is basically for just pvp mainly for the Mortal Strike(you never see a war that isn't arms in an arena).
fury i would say is best for lvling if you solo... and then prot is good for raids or if you plan to lvl, best way to do so is to do many instances(shouldn't be a problem since theres always ppl looking for tanks).
fury i would say is best for lvling if you solo... and then prot is good for raids or if you plan to lvl, best way to do so is to do many instances(shouldn't be a problem since theres always ppl looking for tanks).