I prefer the manga. I love them both, though!

as i haven't read the Manga

although the manga is freaking boring as shit and there's much more going on in the anime. i just felt that the anime made no sense. yukio getting the blue flames srsly wrecked it for me.

Anime.
The manga is okay too. ^^

Anime I guess, I'm not all that excited when I read the manga.
Not that I don't like the manga. :)

Both of course ^^

Anime!! I think it is more cooler! :D
Well, The manga is nice too.

To be honest, I can't choose. I love the manga and show equally.

both but anime is better

I like them both, but I slightly prefer the manga ^^

I like reading manga but in ao no exorcist I like anime

Only read the manga...

But I love both. The anime has its own ending but it was unexpectedly well-thought and I'm really liking where the story is heading in the manga so....

I've only just read the manga, so until I watch the anime, I have nothing to compare to.

The manga. . . . Once I heard about the cruddy ending in the anime, I was like "Nope."

I love both tho ... But Anime is more fun

I love both very much but I like where the manga is heading better then the end in the anime.

the manga is so great, longer than the anime, and a lot more suspenseful where it left off.

I feel that the anime made Rin a bit too overpowered. For one, he defeated Amaimon (the Seventh Demon King and the King of Earth, who is several hundred years older than him) in their first battle, but in the manga, Mephisto stopped the battle

Hearts and rainbows all the way for both but the manga is much darker and more in depth so that gets my vote.