No preference. Up until we got Willow, we had nothing but male cats (dad's decision, because apparantly males are better :roll: . He claimed female cats scratch more). But then we got Willow, our first female. Willow's not a very good role model for female cats (she scratches), but then we got Buffy, another female, and she's definitely one of the top favorites of the cats we've ever had. Of course, we love each and every cat we've had, but Buffy's the funnest, most easy-going cat we've had, and it's extremely hard to not love her.
I love having males because part of me is just used to it, and they are pretty laid back, but females are great too because it just seems like they have more personality (but maybe I only started paying attention when we got Willow). I don't remember our first cat (I think he was spunky though), but the male we got from the shelter was laid back but reserved towards human contact. The male we got from a friend of mine was laid back and friendly, just like Buffy except he preferred to sleep (just like Willow, lol). 3 males and 2 females, neither sex really winning over the other.