oohh thats a tough one...
I'll give you my top few..
Snow White
Lion King
Little Mermaid
But i also Love Monsters Inc...so funny
Gotta love Cinderella
and i really like Brother Bear
Ok i guess im really not answering your question and could probably keep going and going..lol
There are so many great movies and so many classics...i really couldn't say what the Best One Ever could be..Sorry
I would like to see what everyone else has to say though...
Personal animated favorite - Lady and the Tramp
Family animated favorite - currently Hercules
Personal favorite blast from my past, non-animated - Summer Magic
Favorite mix of animation/live action - Bedknobs and Broomstick
Being a water lover and scuba diver, I have to vote for Little Mermaid and Finding Nemo. The scenery in Lilo & Stitch were great too. My son likes anything with Buzz and is into pirates now. My poor brother has to watch Nemo every time he babysits my kids too.
Well, for sentimental reasons, I love the Rescuers...from Disney's "dark ages", I know, but lil sis and I had the record and listened to it everyday. I still know every line.
In the modern era, I thought Incredibles was...well, incredible! I think I loved it more than the kids did. Great humor and parody.