Both have good songs, from emotional to sweet to funny. Though I find myself humming more the songs of Swan Princess than Anastasia. (Practice and This is my Idea are hilarious!)

I guess Anastasia's songs are higher quality, but I find myself singing The Swan Princess's songs under my breath far more often. (The introduction song, Far Longer Than Forever, No Fear, and many more.) From Anastasia, while I love Journey to the Past and In the Dark of the Night, I don't really remember or sing them very often.

By far!