Anime. I used to buy manga once a month from the local anime store, but I stopped doing it because it's just an expensive hobby. Not to mention, the store closed down a while ago, so that's that.
Manga is really not my thing anyway. I still have quite a handful of manga I have not read yet (they are still sealed in plastic) and I'm the kind of person who likes multitasking and if you read manga, you know you have to hold it with two hands unless your binding is loose (sometimes you can hold it with one hand, but your hand gets tired).
As with anime, I can have my Windows Media Player window open and watch an anime while having another window open so I can look at things on the Internet. Or if it's breakfast, lunch, or dinner time, I can go into another room and eat while watching anime. If I was eating food and reading manga, it would get all dirty and I hate that because I like having my books in good condition (which is why I don't like reading manga in public either because people come up to you and ask you if they can read it after you're done like you are their personal library and then they don't take good care of it because it's not theirs).
Anyway, if I were to read something, I would rather sit and read a good length novel than a graphic novel. Besides, if I'm reading an action manga, I might as well just watch the anime and see the animation. It's just more appealing to me.