Originally Posted by
Somus
I think it comes to preference and other talents. I think with BT, Death Siphon is in my opinion the way to go. I beat most Death Pact Death Knights 1 on 1, once they have popped the pact, its only a matter of time before they run out of juice.
Also, if you being kited... Death Siphon is better as you are able to keep using runes and generate RP to keep throwing out Death Coils which in turn generate more BT's. (works great with NP)
Death Pact remains best when protecting against burst. Siphon will do nothing.
I find I'm not focused that much in Arena or BG's because you know... Death Knight and all.