I went with a boy and a girl because I want the best of both worlds. If I am spending $1600 on cats then I damn sure want to own both genders. Girls and boys have different characteristics and you kind of miss out if you get two of the same.
I was lucky enough to get the top female and male kittens the breeder had. They are both alphas and this was obvious even when I first saw them at 10 weeks. Now, they are the best of friends, but individually they interact with me differently.
I get male affection from Leo - lots of head rubbing and physical love like diving into my lap or getting his cute canter on when running for cuddles. I get female affection from Chili which is a more quiet, subtle and refined type of love (because shes cute and they knows it(. Even though all cats are individuals and may act a certain way irrespective of their gender, from past experience owning male and female cats, there are certain traits they always bare.
My two play fight every day, but they seem to take turns at being sub and dominant. I like watching UFC/cage fighting and its rather comical when the commentators sound like they are calling my cats fight in the background
After the fight they curl up and clean each other. Girl and boy ftw