It depends...I prefer Ghost in the Shell anime over the manga just because I don't like the nature of the characters in the manga as much (probably cos I saw the anime first). I prefer the Gantz anime over the manga (yes I know that means I'm sick) because I think action works better on screen (at least for me) than by reading it and looking at still panels. Samurai Deeper Kyo was better as an anime as I don't remember there being any huge demons etc in the manga to the point I read, which is what I liked about the anime... Hellsing - i'm only two books into that but that seems pretty much the same for both. .hack//twilight was better as manga for me, same with pet shop of horrors, akira, battle angel alita and dominion. So I like them about 50/50 [img]i/expressions/face-icon-small-tongue.gif[/img]. Also series with sad parts to them, from what I've encountered don't work anywhere near as well in manga form...

I've not read the excel saga manga - might look for that once I watch eps 25 and 26 of the anime...