Moogles destroy all.
That and Tactics, even if's just ripped from Ogre Tactics. Tactics is by far my favorite FF.
IX was sweet, but I only rented it. X I've beaten two times, It's run it's course. VII I got to the 3rd disc and just stopped.
FF I was awesome but I got stuck in a cave and wasn't at a high enough level to beat the boss and was stuck between grinding for levels and just dropped it. Shame, since it was almost as fun for me as X was. II is garbage. VI is the only one I haven't finished that I actually intend to someday, probably only because it's so classic and reminiscent of Chrono Trigger.
I played CT first, leave me alone. Also had every ending for that game back in the SNES days.
IV was actually really good, but once again, I got stuck. I don't have patience for most RPGs, they really need something unique to pull me through.
VIII is garbage in a similar way that II is garbage. And I really haven't been interested in any new FFs since XII, which I also didn't finish, for gameplay reasons.
V looked fun, since it's the first FF with the job system (other than III but I don't want a DS right now) but once again, got stuck on something dumb due to the classic RPG move of giving you no indication of where to go or what to do. I only put up with that for Dragon Warrior I due to nostalgic value.