Best class for W.o.W?

Ok I have a toon on killrog, and hes a tauren pally. It is really hard to use him in like pvp, he is decked out in good pvp gear but is still underpowered. He is an awsome tank. Any advice. Or is there a better class to choose from. People always tell me to choose what i like best, but i dont no plzzzz help