Honestly, I love all 3, although my vote went to 2D animation, mostly because of how hard it is and how hard animators worked in this method. I admire those who had the courage - yes, courage - to hand draw countless frames of countless movies during a very long period of time, so that they would create something that they'd be proud of and that would, in case of Disney movies, "stay for history".
However, I don't think that computer animation and 3D/CGI should get as much hate as they currently do. Yes, it's true that 2D movies took longer and were harder to make, but, personally, I do not think that that is a valid reason to underestimate the work animators put into current movies, as most movies, at the moment, are CGI ones. They try just as hard to make the movie perfect and enjoyable for everyone, and it honestly hurts me when people "attack" these new animation methods, as if the people behind recently released movies didn't do a thing and as if their job is the easiest thing in the world.