DK vs Warrior

[Urthrun]

My story is an interesting one. I leveled a DK to 80 shortly after my Shaman, for the sole purpose to tank. Yadda yadda, here we are in 3.2. My DK is still in his (at the time) good Naxx 25 gear, as a blood tank. However, I seem to be... lacking. I tried to tank a few bosses in 25 Ulduar and got wrecked in two hits. I like how the DK plays, but I feel limited because of something.

However, I DO have a new 80 warrior tank who I'm really enjoying tanking and offspec DPSing. His gear is no where near as good as my DKs.

My questions is: Should I "ditch" my DK and start gearing up my warrior to tank in Ulduar and onward if the guild needs it? Or what advice can you give me to grab my DK out of the clutches of getting two shot?

My DK's Armory (http://www.wowarmory.com/character-sheet.xml?r=Mal%27Ganis&n=Urthrun)

My warrior's Armory (http://www.wowarmory.com/character-sheet.xml?r=Mal%27Ganis&n=Ingvarr)

Thanks!

[Satorri]

Seeing as how this is not at all a mechanics-related question, I'd highly recommend playing the one you enjoy more. Focus on that one, play him a lot, get him geared, and learn how to be a really epic tank of whichever you choose to be. =) The more you float the longer it will take to become good with either.

[Urthrun]

Been working with the Warrior a lot lately. It's awesome. Going to try out the blood spec I have currently on my DK for a few days, then I'll make my choice. Thanks :P