Originally Posted by
BLSTMASTER
Well its a matter of preference.
Not considering your play style, the main difference would be that warrior tanks are kind of a jack-of-all-trades type of tank (nice cds/ decent health/decent mitigation,) with lots of utility abilities(not all are used on every fight tho. some shine in particular fights, like 'safeguard' talented intervene in LK or vigilance-> taunt spamming the spirits for LK)
A DK tank has more smaller survival cooldowns and even when you're tanking you kind of feel like you are dpsing (or at least I did.)