All Tanks are equal.

[Nektulos-Tuor]

Wrong. Not the same Benefits.
PLD's Shield Oath: Reduces damage received by 20% and increases enmity, while lowering damage dealt by 15%. Increases accuracy by 5%.
Cannot be used with Sword Oath. Effect ends upon reuse.
DRK's Grit: Reduces damage received by 20%, while lowering damage dealt by 20% and increasing enmity. Also increases chance to hit by 5%.
Effect ends upon reuse.
WAR's Defiance: Increases maximum HP by 25%, while lowering damage dealt by 25% and increasing enmity. Increases HP recovery via curing magic by 20% for self. Also increases chance to hit by 5%.

WAR would be OP as hell if they had a reduced damage received by 20%, increased maximum HP by 25%, increased enmity, lowers damage dealt by 25%, increased HP recovery by curing magic by 20% for self, and increased chance to hit by 5%. As a WAR main...even I think a tank stance like this is madness.

But as for the OP, this thread should not have even been created. All tanks are equal? This is far from the truth, play all three tanks at 60 and see for yourself before making this kind of ridiculous thread.

Paladin is 15% now instead of 20%.

This is why Dark and Paladin are near the same DPS when they are going full damage.