Darklight.
I kid, I kid. The AF set is definitely the most "Paladin", since it's literally designed to be that way. The PvP set also has that going for it and the Wootz set is pretty sexy while being more Knight-esque armor than something a Warrior would wear. So all 3 of those would have my vote, though if you glamour the AF/PvP set it won't show up for WAR/DRK.