question like those should be asked on the official site :
but i will answer you anyway :
Blader = best in pve , good in pvp ( fast skills )
Force blader = great in pvp , good in pve ( great debuffs , big dmg )
Magic Force shielder = best in pvp , sucks in pve ( is the ones that uses cannons and lances and it's build with lots of INT )
Sword Force shielder = sucks in pvp , good in pve ( i don't recommand you this class.. )
Wizard = good in pvp , good in pve ( best at stunning )
Warrior = good in pvp , great in pve ( big dmg )
Force archer = nice in pvp , good in pve ( tho it's my favorite )