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Fairytale of New York is objectively the best Christmas Song, but my other faves are Merry Christmas Everyone (Shakin' Stevens), Merry Xmas Everybody (Slade), Do They Know It's Christmas, and War Is Over.
I listen to Pentatonix's Christmas album(s) every season. I don't think I have any particular holiday songs I like, but it's more about how it's sung. The same song can be completely butchered if it's not in a style I like, and vice versa - I never really liked songs with heavy biblical references like God Rest Ye Merry Gentlemen or Mary Did You Know, but I enjoy them on the PTX album just because they make them fun to listen to.
Carol of the Bells as played by the Trans-Siberian Orchestra is the only truly good Christmas song that doesn't get tedious after hearing it once in your life like all other Christmas songs do.