VIII! I loved the story, characters, gameplay, music, everything!
I just loved the whole overall feel of the game.
The story was engaging and interesting, and not extremely hard to follow like other games I've played. There was not one character in the game that I didn't like. I <3 Zell and Selphie xD.
At first, the junction system confused me. But now I love it. It let's you decide what stats you want your characters to be strong in and you don't have to boost stats that you don't want to. I also liked how you didn't really have to level up or grind at all.
I see that VIII gets a lot of hate for not being as 'cool' as VII, but I'm fine with people thinking that way xD. VII fanboys are annoying, and I'd hate for VIII to have fanboys like that.