I'd say we all start off as female, the rudimentary reproductive system being capable of developing all manner of differences. Usually though, with the presence of the SRY gene, (no matter what chromosome is happens to be on, there are 46XX males for instance), male genitalia will develop provided there is fetal testosterone to bring about that development.
To say one gender is superior to the other is a bit silly, really. Males and females happen to be required for reproduction. Both need each other equally, literally speaking.
And recently I read of a 47XXY fertile female who conceived a female child who is also 47XXY. So as time goes by, we learn more and we need to change our ideas of sex and gender as a result.
It's not the chromosomes that are important, but the genes they carry.