ive got a 38 lock and a 32 druid. ive seen many you tube videos with moonkins and locks doing a hell of damage in pvp but im not too sure about which class is more wanted for raids. i really enjoy playing pvp i and i want a pretty decent class to play it, ive asked a few people in my guild and they all have said moonkin because apparently they are more wanted but i think they might be a bit biased i don't know.

i like both classes

druid-
you can heal yourself properly unlike lock (but there are health stones)
good dps
and i just love the spell star fall

Warlock-
dot spells come in handy
very good have a permanent pet
soul stones
life tap for mana
drain mana-drain life
summon friends
teleport to demotic circle.