DK Tank in training, Unholy vs Frost for AoE Off-Tank Build.
After returning to the game after a few months absence due to RL matters, I've started leveling my DK tank once more. At the time I had started, I had decided upon using an Unholy AoE tanking spec, with my aim being to create a good off-tank who could effectively manage the adds and whatnot that come along in many encounters.
I can't find the build I was using anymore (nor, in fact, have I come across many Unholy Tank specs) and I'm reconsidering what might be the best spec for AoE tanking. Is Unholy still a viable choice for this? and how would it compare to a Frost AoE build?
Feel free to post essays, I figure at this early stage 'hitting the books' on the theory is something I need to do anyway :P.
EDIT: Armoury Link - Faubidan