Undoubtedly manga.

I'd have to say anime. I've grown fond of some of the soundtracks that express more emotion to a scene.

I vote anime but I cannot vote now because the checkboxes on the choice are missing :I

lol...thats a good quetion... the problems of the animes are that they arent always finished (like Fairy Tail, Naruto I think)....the manga IS mostly finished...and sometimes I like watching more, but sometimes I prefere reading.....so yeah, this is really a good quetion ^^ I will vote later.

It is better Manga, it has more progress than the anime and it have more details.

I choose anime because reading manga is really confusing since you have to read everything backwards.

Anime has much greater potential then Manga. Color, Sound, and Animation Vs. Black and White with words and Drawing
However, Anime has a much higher entry cost than Manga so Money is more important than quality.
Hence, at least for me there are a lot better Mangas than Animes.
I say Anime because a good Anime can go much farther than a good Manga.
For example: Shingeki No Kyojin is really good in anime and manga, but the soundtrack, voice acting, and animation makes it much more intense than its Manga counterpart.