I don't know, it was my absolute favourite Christmas special to date! I especially loved the theme behind it. "The Lion, the Witch, and the Wardrobe," was obviously thought of when they were creating it. 🙂
Now, I didn't care much for "End of Time." I just really didn't care much for Davies' writing. I thought Tennant is what made his episodes turn out so well. Personally I feel that Moffat's writing allows for a broader audience to enjoy the series. Whenever I introduce a friend to the series, I always show them one of Moffat's episodes (Blink, Girl in the Fireplace, and the past two seasons).