I had a hard time deciding on that,and my opinion is that FFVI is the best,and,imo,FFVII is the second best.They are both masterpieces of the kind,with unsurpassed music,script,and depth.Why did I choose VI?Well,maybe because of the great difficulty of the game,and more because of the feelings that I got from the characters (just marvelous script)and also because the story changed dramatically and left me astounded.