Besides the obvious conundrum of how do u want to deal the damage; from the front or from behind. What else makes these 2 different. I mean in most MMO's i've played assassin's(stealthable charaters) have been the major damage dealers to single targets. So wuts so special about the fighter class and how is that going to effect how they both play against and with each other.(pretend all the periods are question marks )
I don't expect a straight answer considering how recently the classes were revailed but some reasonable speculation would be nice.