Lion King and Aladdin 4 and 5?! Clearly 1 and 2 man.
Outside of Spirited Away and Princess Mononoke I think Pinocchio is the greatest animated film ever made.
The level of detail and effort that was put into every frame of animation is close to unmatched(The Thief and the Cobbler may be the only other film that I've seen that level of detail). Bambi would be higher on my list if it wasn't for the fact that they had a horrible transition between a moment of sadness and the third act that completely ruined the pacing for the rest of the film.
I love the style of Lady and the Tramp. It perfectly captured 1920's Midwest Americana and does it with such a vivid style that Its entrancing, like a watercolor painting. It was also the first animated Disney to be filmed in 2.66:1 and the movement of the characters felt so real and they filmed it in such a way that made you feel as if you were watching a play.