Warriors vs. Mages: 

Warriors:

Pros: Great damage, awesome defense, powerful PvP skills
Cons: Difficult to level at higher levels, cannot normally hit more than one target

Mages:

Pros: Attack from a distance, powerful XP skills that can be complimented by the normal skills, can get the most out of the online Training Grounds
Cons: Poor base attack and defense, poor in PvP until upper levels, almost needs a team until upper levels