I have a soft spot for both, but Balto is probably the better movie.
I'll throw in a vote for FernGully if it makes any difference.
I think the animated Anastasia was based on an earlier live action movie. I heard a rumor that Don Bluth was given the choice of doing an adaptation of that movie or My Fair Lady.I'll pick Anastasia, it will always be odd that someone thought using a real historical figure and rumor they were still out there and thought yes that's my family film.