First half of the anime is better I think. The guy who sat on the pillow, his story alot better handled in the anime, made me tear up a bit, manga didn't do that. About halfway through the theme changes and turns to Gonzo shit, but decent Gonzo shit. Manga get better as it goes along, the fat kid's double page spread is one of the most beautiful moments in any panel I've ever read.
Watch the first half of the anime, then read all of the manga.