I second that second that FF9 is second best. Yes 6 is my favorite. I like it because it focuses on several characters rather than one, all of the characters were likeable, not to mention the story line kept me interested. And of course, above all it was the most entertaining Final Fantasy ever. Same reason as to why I like 9, oh god that was a fun game.
My main reasons for liking FF6 is probably because of A.) Celes opera scene B.) The final battle was superb and the final dungeon was awesomely fun. C.) Oh and the hilarious how Terra was conceived part where Madonna and Maduin dance around shiny stars aka had sex.