I suppose I cannot really answer that question, there are many factors that would have to be considered in order to fully flesh out a system like this, one in particular is "Do Advanced Jobs grant entirely new weapons, or are they forced to wield weapons that fall under their parent classes?"

If the answer is the latter then one big difference would be that while some jobs might have similar abilities the type of attack (Slashing, Piercing, Blunt) is different and that alone should/would make similar advance jobs shine over others. For example you could (For discussions sake) say that Warrior and Dragoon are similar jobs, they both focus around dealing melee damage; but one is slashing melee and the other is piercing. On slime based monsters I would prefer the Dragoon over the Warrior for this very reason, vice-versa if a monster was weak to Slashing only then the Warrior would be the preferred choice of job.

This could be taken into context for the rest of the jobs as well. Also remember that a lot of these jobs all had there own function in the many worlds of Final Fantasy, and many of them come from FFT/FFTA where there was a plethora of jobs to pick and each of them had their own uses.