The Doctor Who Facebook page asked which is your favorite Doctor Who Christmas special?
"We can't quite believe that it's 4th December already! But that does mean only 21 days until this year's Christmas special, The Snowmen! Which has been your favorite Christmas special so far?"
A Christmas Carol
A classic story that is Christmas. Since I know the story well I can look pass that and see the Doctor do his thing without having to think about the story too much.
Image is from the Doctor Who Facebook page owned by BBC.