Well, I consider "classics" the ones from the '40s and '50s. My grandparents had a bunch of them on VHS and I'd always watch them when I was a kid, and back then I had no idea they were that old (Snow White, Pinocchio, Fantasia, Dumbo, Bambi, Cinderella, Alice in Wonderland, Peter Pan, Lady and the Tramp...). They are all beautiful pieces of animation, and Fantasia is quite interesting from a technical standpoint.
But my favorite cartoons are probably the ones from the '90s: Mulan, Tarzan, Hercules... - The Lion King was also a great feat of animation. Two other movies I watched a lot as a kid were Oliver & Company and The Aristocats.
However, as an adult, the only Disney movie I actually like and would rewatch is Cruella (2021)...

If we count Pixar, Wall-E was also cool, and I watched the first Toy Story tons of times.