Best Tanking Class

Now... I have heard talk that there is one class that is great for AoE tanking, one for Single Target, and one that is a 75% solution to both...
Is this an accurate statement?
BTW: They said that BH Powertech is the 75% solution...
Also, I might be interested in some assistance on my current build...lol

I think people have posted that for single tanking Assassin > Jugger > PT for the most part and then for AoE its PT > Assassin > Jugger, but thats just what i've been told, and what i think is best is Assassin > PT > jugger, just cause i've seen Xanna tank as ass and hes >.> well one of the best lol and i've play'd PT tank. i wana play jugger but that will have to happen later lol to buys w/ PT tank atm

now...onto the question of a build...

Here is what I currently have (at level 37)...
http://knotor.com/skills#AgMcAAAzSlFaaXJ6gpGaoaq609oA
ans here is my plan for level 50...
http://knotor.com/skills#AgMhAwURNUpRWmJpcnqCkZqhqrrT2tvS2wAA
Any inputs/suggestions/assistance/recommendations?

Thanks

Single target I would definitly have to say that Xanna probably has one of the best tanks in the guild. When it comes to the Multiple target stuff, I say that Powertechs have the best abilities to handle multiple mobs in large pulls.