FF7 all the way
FF8 sucked ass
i jus couldnt get into the 2d ones even after i completed em they still lacked a hell of a lot for me (except there was a flyable dragon in FF5. pretty cool)
however ten and nine are bothe a close second

by the way does XIX stand for 19 (sorry i really suck at roman numerals past 11 and i can only do that coz of Final Fantasy)