The major difference between paladin and warrior is how much EASIER the paladin is to play. The warrior is much more about well timed self heals and knowing when to use things like berserk... or maybe a "defense" cooldown. A paladin can mostly spam his attacks, and throwing up a defense here or there in case of a "oh crap" moment.

Ultimately though, a warrior needs a scholar in the group. The rapid heals and absorb buffs make a perfect match with the warrior. The self heals become near worthless if two white mages or a warrior are 'competing' on who gets to heal the tank.

The need for attention and 'skill' is what makes the warrior valuable. If warriors are to be made better, make it minor. A 5% defense boost OR a 5%-10% self heal potential increase. Anything more than that would turn the warrior into another mindless job. Paladins are fine as they are.

(Side note: I wonder what people will be saying when PVP gets into the game...)