I'll go with Manga, since a large majority of Anime comes from Manga.
Lots of these Animes suffer from catching up to the manga and create filler content or long gaps in seasons.
Also many Anime suffer in quality compared to the manga they originated, be it animation style or quality / skipped content / censors.
Not to say all anime is bad. I still love some of the VA's out there and the setting / fights / characters in motion are quite a treat. It's just hard to compare to the manga from where it originates.
I can say Anime has a much better track record with adaptions from Visual Novels or when its original content though.







