Warlock or Priest for PvE dps and which talents, what's better?

[BEBAC1g]

I know that it is about skill all but if there is better one of these two tell me and explain if you can cause i didn't play with them
If you can comment about PvP wock or priest

[RyokoKonatsu]

Ice has x7 xp ratings. Its not that hard to test on your own and then decide who is what. Most of us did that before when we was kinda new or totally new in wow. Dont be lazy. Or check youtube