Demonology Warlocks have arguably the best defensive toolkit in the entire game. Between Voidwalker. Moreover, there is no one-size-fits-all best PvP class or specs in Classic. They are specific to the PvP content you are doing. For example, Feral Druids are S-tier amazing in Warsong Gulch, but are nearly useless in Alterac Valley. AV builds are different to AB builds are different to WSG.