Which Class for a PvP-Server?

[Bob the Beholder]

I haven't played either class in PVP.  I do have a PVP rogue who likes to kill all cloth wearers. I want to say that perhaps priests have been a tougher fight, but it hasn't really been true for me.  When the rogue gets the drop on a squishy, they are going down.
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People keep saying that, yet I keep killing rogues who get the jump on me. Two rogues once, even. And a rogue and a warlock. *shrug* More about the player than the class.