Which class has a better dps, Warrior or Death knight? WoW(cataclysm)?

I have played in close quarters with both Warriors and DK's, they are very similar in DPS output for PvE, Blizz has balanced them well. For PvP however I find DK's tend to do a little better, with their strangulate, brain freeze and chains of frost etc. There is not really much between them, if it was up to me I would take a warrior, but that's cos I don't play PvP much and there seem to be heaps of DK's around.