The best FF for music/soundtrack has to be FFX, it start with the heavy FMV blitz sequence track and continues with excellent consistency, also, I love the piece 'In Zanarkand' because of how it is intertwined with Tidus' emotions at that point in the game.

FFVII definitely had my favourite characters. Cloud was awesome, and had a lot of character development throughout the game, which I liked a lot. Tifa and Barrett also had a lot of development, in fact, nearly all the characters did. The only downside was Yuffie… god I hated her! That's why I never even bothered to get her after my first play through. But Vincent is cool.

FFVII's Vincent was my favourite character, simply because he had my favourite back story of any FF character. The dark, dingy former Turk that had a unknown number of horrific experiments done on him to the point where he has the ability to become a monster.

FFVII has my favourite battle system, everything you need to know is at the bottom of the screen, so at a glance you can check everything (plus I love how they changed the system after FFVI)

I think my favourite FF villain had to be Kain from FFIV, for the part of the game where he's actually against your party. It was the first time I'd fought against my own party members and I thought it was brilliant for the plot development of the game.

FFX has my favourite storyline, the transition to Spira is a bit… odd, but the rest of the game follows through perfectly. Especially with Tidus being the outsider of the game, and you seeing it form his perspective, learning things as he does. Also, the characters join the party at well timed intervals, and the two Zanarkand's was very intriguing.

FFX defiantly had my favourite ending. It seemed to sum up the whole mess of things that had happened throughout the game very well I think. Plus it was the first time I had ever seen an FF character cry, and this was made all the more moving by the fact that it was the lead character who was doing it.

So, overall it looks like my favourite FF is FFX with FFVII a close second behind it (and this took ages to write as well!)