Paladin will always be a better tank than warriors will ever be (mitigation wise).. its designed that way

they have better utility in form of having both silence and stuns
and you can SS yourself or MT during transition phases

and theres nothing that will compared to hallowed ground in terms of overall usage.. holmgang is good only in paper (since you still incur damage and cannot move/forced to eat redzones)

what warriors have over pallies is better threat generation both single and aoe.. but threat isnt really an issue nowadays.. warriors deal a little more dps too