Paladins don't take the most damage out of all the tanks if we are just looking at the bonuses you get from just being a tank. Stamina doesn't reduce damage, and the bonus armor and block from shields combined with the extra 5% from the paladin tank passive ends up being more. Now if you wanna get into TDR I don't know how the numbers would change but I would imagine tanks perform pretty equally. Though I have no idea why you would want to since its not total damage that kills tanks, its spike damage which paladins can reduce on demand more efficiently than every tank but monk (stagger is OP).