I find mares more interesting and fun to ride. Give me a gelding with some spunk and yeah, Im sure Il like him as much as I like mares with spunk, the only thing is most geldings (not all, just like, 90% of them) I've met are either indifferent in their attitude or a pain in the butt. Its not the sex that makes the horse a better ride, its the attitude and I just prefere spunk and spark to a 'yeah, whatever, if you insist' attitide; just so happens more mares fall into the 'spunk and spark' categorie!
And back to the origional point: When I was younger there was a lad in my lesson who prefered mares (if i remember right). My best mate's younger brother rode for a few years and he loved Fudge (a gelding). I, female, generally prefere mares, however my best mate (also a girl) has had both mares and geldings as favorite horses. But most of my mates favorite horses havent been exactly to my taste. I put it down to personality match more than anything else.
We lose ourselves in the things we love, we find ourselves there too ~Kristen Martz