I like Christmas, personally. People just seem to be a bit more...festive. I like the music, too. They're fun to sing in groups and are open to a wide variety of musical interpretation. I also like getting together with the family for a big meal.
On my birthday, I just want to hang out with people. Not have school, not do any work. Just hang out. If those people aren't having to do anything either, it's a holiday for them too 8D