DS tends to prefer non-fiction and is picky about the fiction he reads. If he reads fiction, it tends to be super silly, like "captain underpants", or fantasy fiction where people travel through time or something of the like. He doesn't seem too interested in fiction involving everyday modern life, like "my parents are getting divorced and my friends don't like me" or whatever.
DD on the other had will read any kind of fiction but isn't too interested in nonfiction. I think boys (in general==of course there are lots of variations) have a greater preference for nonfiction than girls. Boys aren't as interested in emotions or social relationships. I know it sounds like stereotyping but from my experiences working with kids reading, and what I was told by teachers, there is some truth to it.
