Ok, so I have both a 70 warrior and a 70 lock. I like them both equally. Thing is, I'm only going to use one of these to do 2v2 and 3v3 with some friends that happen to be a priest and druid. Which one would be better to transfer over to their server? Which class would be the overall winner for both 2v2 and 3v3 along side a priest and/or druid?

Funnily enough I have a 70 warrior and a 70 lock as well :P

Anyways, really depends on their spec!

Tell me their specs, I don't want to cover all potential possibilities :P then I'll give you an answer.

the priest is shadow and the druid is resto

definatly go warlock. In 3on3 and 2on2 :)) actually warrior + druid can also work fine 2on2 :)) but 3on3 i would say warlock + shadow priest + resto druid. The shadow priest increases warlocks shadow dmg :)) more fears :)) silence etc etc :))