As far as stories go, I voted VII. Though I believe the only reason why I think this is because there are so many mini-stories and back-stories to the game that you know more of the story and feel drawn into it. Though I am pretty honestly fed up with that Nibelheim scene, similar events even happened in Dissidia, I remember flipping the bucket when I saw the footage.
Coming close in second is X, which is probably my favourite out of all the games, I did enjoy the story and all, it was a bit to romancey in some places that I found a little meh.
Coming close in second is X, which is probably my favourite out of all the games, I did enjoy the story and all, it was a bit to romancey in some places that I found a little meh.