9,10,6,x-2,7,4,2,5,8,1,12 Never played 3 which makes me sad.
9 has the best storyline, it's cheerful, it goes back the FF roots and is the only FF game that doesn't have a sad/disappointing ending.
10,6,7 and x-2 are all really close together and they could switch based on how i'm feeling/playing. 10 was a beautiful game, story was great, and it had auron. 6 was a HUGE game, it was fun, had THE best villian in any game and the story was great. x-2 despite people hating it is one of my favourite games, Squeenix made it to be a fun game and not to be taken seriously, it has a fun soundtrack, the job system was fun, the sidequests and damn is it hard to get 100% in it, which is nice. 7 is fun, probably the best battle/skill system, story was there too, i just find it overrated and has been drawn out, but don't get me wrong, i like the characters, music, storyline, etc. it's just meh to me.
4,2,5 are all really close too, great games, i'm sure it's just the SNES gameplay that hinders it for me.
And finally 8 and 12, both games i can't stand, 12 more so, mainly because it's not an FF game, the story line was horrible, with the big bad never really being a big bad. It wasn't so much of "I'm going to destroy this planet" as it is in every other game, it was simply "I'm gonna take over this continent and control it with my dictating ways" boring. If i wanted that i'd go to Cuba.