Many of the anime out there are based on manga, with the reverse being true only in rare cases (i.e., Cowboy Bebop, Escflowne). I find that the manga that inspires the anime as a rule tends to be much better.
Some cases in point:
1. Samurai Deeper Kyo: the manga is 26+ volumes, and yet the anime is ONLY 26 episodes! Many characters were left out
(and one was added) and the animation has nowhere near the stunning artistry of the manga.
2. Rurouni Kenshin: I already have a rant posted on this in my RK review, soI will limit my statement to: Manga Kenshin does not wear pink. Anime Kenshin does. Sylvacoer HATES pink.
3. Ayashi no Ceres: I just think Tooya is ever so much hotter in the manga!
I'm sure there are others I can bring up, but I'll limit it to three. So, what's your opinion? You can talk about anime/manga overall being better or mention some anime that are better than their original manga (or vice-versa; this is a flexible topic. *~.^*)