My favourite Disney movie is Pocahontas. Mostly because I really love the soundtrack and bought the extensive two-disc version of it, but I also like the animation and how well it flows. I can understand that it's not a very well received Disney film because it was only very loosely based on a true story and not completely based on it, but it's not like the movie tried to present itself as a real historical piece anyway (nor should Disney films be taken as historical material, imo). Other close favourites are Mulan and yeah, I could put Tangled up there too. Oliver & Company and Princess & the Frog are two of my favourite Disney soundtracks alone. "Bedtime Story" from Oliver & Company is one of the best movie instrumentals I've ever heard.
Pixar wise...Finding Nemo and WALL-E have a special place in my heart. I wasn't a huge fan of the live action movies, but I remember enjoying the live action Jungle Book remake. Maybe because I haven't fully seen the animated version yet.
Do Disney Studio Ghibli films count as well? Granted, I've only seen three of them (Ponyo, Secret World of Arrietty and From Up on Poppy Hill), but I've really enjoyed watching all of them.