What's your fav?
Hermie the dentist Elf, Burl Ives the Snowman, Norelco Shavers (sliding through the snow), King Moonracer, the toothless Bumble, etc, are all such memorable, lovable characters, I'm picking Rudolf the Red-Nosed Reindeer. May wrote a good story with a timeless lesson about acceptance.
Muppets usually do a good special. I have the Muppets and John Denver on a cassette tape somewhere. I think I need to digitize it.
There are so many classics, I'm afraid I've not kept up on 'new' holiday specials.