Find a definition that won't get people up in arms about what is the "tankiest," and you just might get answers that don't contradict each other.
Otherwise, tell us what you have in mind as being tanky, and we can give you an answer that actually means something to you. What do you want to do exactly? Do you want to stand there and taunt? Do you want to be more productive than that? Do you want higher damage output? Do you have means for IOing out your tank?
Until we know what you're really looking for, the odds of you coming away from your tanker experience with a positive view are kind of low. People will only tell you what *they* think is tanky. It's been my experience that not all of them agree.
i love running TF's and tend to venture in to pvp zones for fun and a change of pace its fun to go even if its just to die =-) i hate getting my *** handed to me by ghost widow , i love teams the bigger the better so i id like that can