I don't know why, but I pretty much always prefer male pets! They just seem a lot more laid back, and I've never been able to bond with a girl dog or cat like I have with the boys. (: I had two female rats and a female cat, all of whom I loved dearly -- but they were all more aloof and kept more to themselves then my male pets ever did, and I'd definitely pick a male over a female if given the chance.
I have to say though, I think I love my male and female Betta equally! Though at this point I almost think I love my girls just a smidge more, because my boy's tail biting habits have me at the end of my rope! ):
5 g - Mephisto [m]
29 g - Selene [f], Nammu [f], Persephone [f], Tiamat [f], Pattini [f], Ophelia [f], Sati [f]