You're going to get a lot of different answers but my personal favourite is 8. I'm not sure why entirely, I love the music and I love Triple Triad. After 8 being on top I couldn't call a second place because I like a lot of other ones equally for different reasons. 7 and 12 have enjoyable characters (7 also has an excellent soundtrack), 9 has a great setting and mostly good characters (Amarant has no place in the story), 10 has a great battle system, music and the best pacing in the series. And that's just the playstation era, 6 has a great story, and in 4 you fly an airship to the moon. To the moon!
The only Final Fantasy game I actively dislike though is FF1. It may be a classic, but it is boring and slow with out dated mechanics and the pacing is just awful.
The only Final Fantasy game I actively dislike though is FF1. It may be a classic, but it is boring and slow with out dated mechanics and the pacing is just awful.