Since your question is PVP AoE only related there're literally a ****on of things that I would have to ignore but anyway,
I consider druid a better option due to their utility (cyclone, roots, typhoon, bear form with the recover HP spell for tough times, healing support (rarely happens), better dot system probably than DK, at least druid is ranged, melees can have tought times on bgs.
No one would ever invite a DK because of their death and decay spell, cmon TwoEasy you can do better than that lol, at least make a diseases/pestilence reference (even this i consider weak most of the time)

