Most - VII - Everything about this game keeps me glued to it. It's easy enough that I can just start the game and head straight for the ending with minimal levelling, but not so difficult that you have to return to an inn every three battles. The story is just great and performs key events really well.
Least - VI - It's all right, it has it's moments and a few good plot twists and characters. I just hate how they put 14 playable characters in this game. We rarely saw relationships form between characters, or even expanded personalities. Also there's no lead roll - there's a reason why most books, games, movies or stories in general have a lead roll, yet FFVI lacked one. No one seemed to have the leadership qualities all groups should have. It just seemed like a band of random heroes crammed together to me. The characters were pretty decent; they just didn't flesh them out enough. Heck most of the time they just made dialogue boxes without names attached, so anyone could say the lines that needed to be said. This just shows that in the end all their personalities are the same, despite how well done they were at the beginning of their quest.