Who is naturally better at bearing children -- men or women?
Reality isn't gender-equal, or even finely balanced like a Starcraft game. Equality means equal rights, not equal abilities. (A strict belief in the latter gets us into Harrison Bergeron territory.)
If we're talking cognitive skills, there is rough equality in ability, but a difference in approach which makes one sex better for a particular job than the other. If women tend more to seek social consensus, for instance, they would fare better in a software engineering job with a high degree of peer collaboration, as opposed to the same job in a more "cowboy coding" environment.