I agree with Dory that the PVE staff is best in this case however it depends on your play style if you would reather be a more Defensive player and sruvive longer demonology has so much survivavility, for example they recently added a shield demonology warlocks can get that has 2 charges only like 20 sec cd and it abosrbs around 1300 for each charge, destro is for more 1v1 besides spreading immolate arround and ive never tested afflict but im sure its for those long midfights to be more support for your team and not bursting someone down, imo it depends on how u wanna play.