blood build:
http://talent.mmo-champion.com/?deat...6&version=9767
+ : Very high TPS at single target, Alot of HP, Excellent for many physical dmg boses of ulduar, The gamble of spelldeflection is really useful.
- : Low TPS on aoe tanking, Takes very high magic dmg if spelldeflection doesnt work, death is unavoidable if you forget to use CD's in some situations (iron council Steelbreaker).
Unholy build:
http://talent.mmo-champion.com/?deat...6&version=9767
+ : Great magic dmg mitigation, Good at aoe tanking, Extremely useful on some ulduar trash mobs, Extremely durable on Iron council, Razor Scale, Thorim encounters, due the excellent CD dancing.
- : Dies very fast if you miss atleast one CD, Low hp, quite low TPS on single target, not made for some of ulduar boses (ignis, kologram).
Correct me if i am wrong on something, but so far i see that DK tanks are forced to use both of this builds if they want to tank in ulduar.