What resisntace charecter is the best?

If you want to be the fastest leveler for the first, second and third job, and when you finally attain the fourth job, you do nothing, other than staying on the same place, shoop' da whooping the whole map, and when it comes to bossing, just enable your machine gun and hold the attack button for the fastest kill, and of course, have absolutely no fun with leveling other than doing the same thing, acting like a machine that is exactly what your character is, chose mechanic.
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If you wanna be half powerful compared to that, a good bosser and leveler, chose any of the other two Resistance.
I'd go for BattleMage or Wild Hunters, both are fun to level, and at least you enjoy doing so.