I have never really been into comics. But I don't have books like little women either. I have few fiction books, and lots of non fiction. When I refer to fiction here, like "ransom", it is generally because I happened to see it on TV. As for fiction books? I have fire starter. The protagonist there that was even heroic, happened to be a little girl. And I bet girls would like it. Boys would like it also. It has suspense, a nice plot, drama, etc.... I also got the last book of harry potter. I was curious how it ended, and everyone seemed to be reading it. So I know IT appeals to most also. AGAIN, one of the main characters is a girl, as I know some consider that important. And it was written by a woman. Hey, there is always scifi!
Anyway, if they decide to prefer girls, even towards moving to very female oriented books and courses, OF COURSE the boys will do worse. The ironic part is I don't think it will make females do any better.