Has to be A Christmas Carol! They're all great but I love the version with Patrick Stewart My girls of course love the Muppet Christmas Carol so we always watch that version as well.
As far back as I can remember, from my earliest childhood christmas memories, we always watched "Bernard and The Genie" but I can't find it on DVD (playable in UK) now and don't have a VHS player for my old copy. I do miss that tradition, I must say. I might just have to invest in a DVD player that will play international DVDs