I'll start with Tanks. While they may seem similar they are much much different in practice. Warrior while having a few skills to lower incoming damage, is a reactive tank. Its all about taking the hit then healing it up after with a much larger pool of hp. Paladin on the other hand is a proactive tank, that has much higher damage reducing cool downs that are easily stacked to reduce incoming damage. This allows the tank to ease the brunt of the damage the healer has to heal. They also generate hate and go about dealing damage in different ways. Paladin has the Halone Combo, Flash, and its AOE DoT skill. Warrior has its Butcher's Block combo, Flash, Overpower, and Steel Cyclone; while not being a hate skill itself Steel Cyclone ignores the stance dmg reduction penalty and its shock damage is nice for grabbing threat. I find Paladin to be the safer option when tanking (especially on single targets,) but that with its alternate combos Warrior to be more damaging and able to hold AOE threat better (but also much harder on the healer than Paladin.)


For Healers its pretty much the same thing. They work great in tandem but are specified to a certain niche. White Mage is about reactive healing dropping large amount of hp on others after they've taken damage, while Scholars are proactive healers who try to lessen the damage with shields. While it amounts to the same HPS overall, the play style is quite different. Scholar also has the added benefit of being able to split their attention between more than one player due to the fairy.