12. I've seen very few situations where an anime series is better than the manga. Actually... I don't think I can name one off the top of my head. The Tokyo Mew Mew manga was so cute and I loved it, but the anime (the original, even) is rather boring and pales in comparison to me...

IMO, I think manga just does a better job of telling the story and fleshing out characters. Anime series are shiny because they have color and voices, but I prefer reading manga in most cases.