I've read all the Berserk manga and played GOW 1 and 2...
I'd say Kratos would definitely win.
He would kill the five dudes of the god hand, the apostles and that huge demon from the latest chapters (you know, the "indian-like tyran" that looks like some giant tree/octopus), all at the same time, and right after that he would bang a few chicks (what Guts would definitely not do)