FFVII is definatly the Best one allround, but my fav is FFVIII mainly because Squall and I were so alike when i started playing it , you could say i literally "took up the role as Squall" and i loved every moment of it (especially sinve VIII was my first FF Game) and naturally VII was my 2nd FF game and i loved that to bits too, i loved going over all the little bits and bobs and secrets.
i really hope that they remake that game with good graphics like they did in teh PS3 Production Trailer of FFVII preview (they showed the very start of FFVII is AMAZING Graphics) here is the link for it
HERE seriously i know its only a tech demo but god i wish they would do it in such awesome graphics, ya know they probably did THAT game just to make us want it even more !! EVIL !!!
and i also loved FFIX that was just a really cool storyline and i couldn't get enough of all the places to go and it just made me wanna play more and more, i also used to be a big fan X and X-2 but due to personal problems and character relations i decided to change my view and hate it ... a lot
and i played FFXI at a EGN Expo i went to last year where they had the game running on Lan, i thought it was alright but the controls were so complicated and i care not to buy it for teh Monthly Rate, i think Squaresoft is pushing it a bit there...
i have also watched the trailers for FFXII and i am SO Looking forward to it, it looks so big (reminds me of FFIX) and it looks like it could give some great story, also i can sense the relationship between teh main male character and female character to be a plot twister ... i think i read somewhere they could even be brother and sister so w00t for incest (this is mainly hypothesised)
and wow Advent Children looks SO Awesome, here's a new trailer for it (not new, more latest) right
HERE