To tank or not to tank?

I have a warrior and a dk. Both are totally dps. Never considered tanking. Never. People are such douchebags that I just have no interest in doing it. That being said, my guild has a tank shortage. If we're going to get anything going we're going to need some tanks. I have collected a decent number of epic gear from instances. I have rep with enough factions that with crafted items added, I could put together a tanking set. I don't really want to waste time dual speccing both. My question to the 3 or 4 people who have glanced at this blog is....mechanically....or whatever.....what is easier to tank with, warrior or dk. It seems both classes have advantages and disadvantages. Anyone care to break it down for me.....in simple terms...me brain hurt when read EJ.