We Three Kings is my #1.
Vocal or instrumental. It always sounds so regal and ancient.
“We Three Kings”
I’m not sure if you’d like it, but Bare Naked Ladies and Sara McLaughlin (I think it’s she) do a very nice arrangement of We Three Kings and Star of Wonder, it’s really one of my faves.
My favorite carol is definitely God Rest You Merry Gentlemen, I think of it as the ultimate Christmas song.
I also really like Joy to the World.