ktangent wrote:
If you're using dark pact quite a bit, you should be drain tanking, not drain hunting, so you'd use your imp, not your voidwalker.
This.
From my experience with both styles, it does
seem that drain hunting is a bit faster xp/hour. It's easier to chain pull through a zone for grinding. With that said however, drain tanking is a bit more fun to me and as a style translates directly to Battleground. The speed that you can drain-hunt through a zone is in large part due to Life Tap.
I use both methods as affliction spec: Drain hunting for grinding or drop quests ("Find me 300 of these feathers from those Owl-Beasts over there"), and drain tanking for taking out elites or, obviously, hitting the Battlegrounds where Life-Tapping is more dangerous.
Using either method I still use Life Tap though. Life Tap is really there for efficiency. You can move more quickly with it than without it (see Elitist Jerks for the theorycraft). That's not to say that you "need" it to be successful. Just helps kill stuff faster and it's just too useful a talent (Improved Life Tap) to bypass in any warlock build, IMO.
Happy hunting.... err... or tanking!