My favorites are those that are Christ-centered. I really don’t see the significance in anything that is not.
The ones I dislike are those that are totally secular. “Jingle Bell Rock” and “Grandma Got Run Over by a Reindeer” are the two I dislike the most, and they seem to be played constantly!
I agree that the best carols are the Christ-centered songs. On the other hand, I still enjoy and am tremendously cheered by songs like White Christmas, The Christmas Song, Silver Bells, and a few other "secular" Christmas songs -- especially when performed by the artists that made them classics (Nat King Cole, Bing Crosby, etc.)