You can't have the best of Both World anyway, Paladin have shield, more defensive skills, better stun then Warrior. But their damage is relatively low. Warrior damage is decent, have lot of AOE damaging ability, can hold aggro on multiple mob better, can replenish their hp. But they don't have a shield which lose a lot of defend, don't have a lot of defensive buff like a Paladin.

Most people take Paladin over Warrior for end game just to be safe and put less stress on the healer. The battle go faster with a Warrior Tank, but the trade off is Warrior is more risky as a Tank compare to Paladin.