Originally Posted by
Gaidax
Depends, really... Cataclysm aside, If it's 10 seconds AoE burst, Demo will win hands down due to 2x Chaos Wave, Immo Aura and Felstorm, but longer than that and Destruction will overtake, IMO.
A small clause here is if Destruction Warlock is specced into Charred Remains then it will be a tie first 10 seconds, then Destro will lead by huge margin.
Considering AoE scenario that lasts more than 10 seconds is extremely rare, it can be concluded that Demo is indeed better for practical AoE, especially considering that Charred Remains blows for just about anything besides AoE.