A complex question to say the least, simply because of what we can be talking about, dmg output, soloing, the necessity of having a healer, whats the mob etc...
But, if you had to decide which job would be the best to take to 90 (99, whatever), taking these things into account what would you say comes out with the most pros? For example consider a graph, a questionnaire of scale, 1 -10, one category is DMG output over speicified amount of time, one is the ability to Solo on a scale of 1 - 10 (which would most likely rest on the amount of mobs the job can take on as opposed to which can take on the least)
Of these categories, what job would you say comes out with the most points?