If I had to narrow it down to one, I’d say Up. But this truly is a loaded question 
WALL-E and The Lion King.
Probably the Toy Story films.
The Lion King
That’s such a hard question. I can never pick just one.
For me its either Toy Story 3 or How to Train Your Dragon.
Pixar: Practically anything they’ve made up to this point.
Disney: Aladdin (going by most favorite)
Others: Who Framed Roger Rabbit
Jetsons: The Movie (for childhood reasons)
An American Tail: Fievel Goes West
The Iron Giant
Chicken Run…
…and probably others that I can’t think of at the moment.
Up. I can’t even explain to you my love of that movie <3
This is not in order. Do not read it in such a way.
The Incredibles
The Toy Story series
Up
Beauty and the Beast
Tangled
How to train Your Dragon
The Iron Giant
The Hunchback of Notre Dame
Ratatouille
Aladdin
Tarzan
You like Iron Giant more than Ratatouille? HOW DARE YOU!
Kidding! Those are all great films, you have good taste.
Beauty and the Beast is probably my all time favorite. I loved the broadyway style production.
The Lion King, Toy Story, Aladdin and Ratatoullie round out my top five
Haha, yeah. But I probably do prefer The Iron Giant to Ratatouille. It all depends on my mood. 
And thanks!
Walle. It’s my favorite for many reasons. I could write a very long post on it. Sometimes I think about during the day and how it relates to me, and I’ll have to fight back tears.