Just like the thread title excludes any Pixar created Disney movies, I generally prefer anything made while Walt Disney was still living over anything done since.
There's a been a few animated post-Disney films I've enjoyed, but the magic combination of good story, good storytelling, and artistry was a result of having Walt at the helm.
Lady & The Tramp didn't hold up well at all for me. I thought Fantasia 2000 was good, but hated the Lion King & Aladdin.
I still love LADY AND THE TRAMP. I only place BEAUTY AND THE BEAST above it, in my list of animated favorites. However, I hate THE LION KING and Robin Williams ruins ALADDIN, for me. Then again, he ruins everything, for me. I also really am annoyed by FROZEN. Above many of my top Disney animated films, I would place 20th Century Fox's animated ANASTASIA.