I love the Anime, I really really do but I will definetly prefer the Manga (though the anime gets a bonus point for Wei and Mei-Ling). I like the Manga because there were more stories developped, like YAmazaki-Chiharu, Rita-Teacher, Sakura's parents, Yukito/Yue-Touya and definetly because it had a great ending. Also because you understood more Shaoran's tough character since he was all alone all the time.
Love the manga very very much!