The best fix for skank tanks, albeit the most complicated, is to adjust bolster in a way that it locks damage values for tanks. No matter what gear they choose to wear, they must have tank stats. A buff to DoT specs would also fix this, but that would make PvP really unbearable for most.
To answer the OP, any tank is fine for regular WZs. Juggernaut normally will be the best pure tank, Powertech is the easiest to learn, and Assassin revolves around utility.