They're pretty much my entire reason for liking X--I mean, I do like some of the other characters, but they're the only ones I really care about. The manga is kind of a mixed bag; CLAMP seems to have not really known what they were doing at the beginning, so it's less coherent than the beginning of the TV series, and the lack of an ending is very frustrating. But once it gets settled the pacing is better, and I can't think of ANY plot points where I prefer the anime.

Plus Sorata gets to change his clothes in the manga.