This one's a dead tie. Two adaptations of brilliant bits of literature in mad and fantastical settings, full of warmth and charm and humor, and that's about all they have in common.
First up is Hogfather, one of my favorite Discworld books and most dfinitely my favorite of the BBC adaptations. The Disc is fully realized and populated, and even with a few missteps in casting and special effects (Teatime never had the right air of pseudo-innocence, and the less sais about Ponder Stibbons the better) it was a joy to watch. The woman playing Susan was born for the role, and the adaptation was a beautiful and faithful one that has become a must-see for me every December.
And the second one... Look, that stuff I said about guilty pleasure television? Is 100% true. Which means that I am saying, without hesitation or embarrassment, that I adore Tin Man. Is it flawed? God yes, from the forced references and occasionally painful dialogue to Zooey Deschanel's acting. But it's also visually beautiful, with a world that feels larger than the story and some insanely fun characters. It's a mix of genuine epicness and glorious cheese, and I wouldn't have it any other way.