Well, for me, there has to be a distinct line drawn between "classic" and "recent films". You just can't compare them, its the old Apples and Oranges thing. Also have to distinguish between Animated and Live Action.
Favorite Classic Animated: I so can't pick just one... Sword in the Stone, Robin Hood, Classic Adventures of Winnie the Pooh and/or Three Caballeros.
Favorite Recent Animated: Toy Story or Cars or Ratatoulle (or however the heck that's spelled
)
Least Favorite Classic Animated: Fox and the Hound or Rescuers Down Under
Least Favorite Recent Animated: Any of those stinkin' direct-to-video sequels
Favorite Live Action: Most all of the Hayley Mills classics - Parent Trap, Pollyanna, That Darn Cat, Summer Magic. Also Swiss Family Robinson, and the original Love Bug. These are my favorite Disney movies; all the Annette/Tommy Kirk/Hayley Mills/etc live-action 60's/70's movies.
Least-favorite live action: Any of the above classics that have been remade.