Ooh this is a hard one to answer on multiple levels. There' so much good animation it's hard to pick.
Also a lot of good animation that I watched with my abuser, kinda lacing those things with triggers. :/
Like the shows were objectively good but were picked out by him, and I know all the things he thinks/feels about those things, and seeing them reminds me of being with him. Kind of just makes me feel sad and just shitty. Reminds me of some conflict too because he'd create it off of anything.
I was into the same type of things for years before I ever met him, though. So I should feel okay with being into those shows but the closest I've come to watching one is learning a song from one of them, that I had seen years before I met him.
Anyway. I really liked Who Framed Rodger Rabbit as a kid. Does that count as an animated movie even though it's live action + animation? Haha.