I like working a male. I've had both genders and usually make my decision on 'what next' according to what lives in my house at the time. I need the dogs to get along without the crate rotate schedule. So I've gone male/female female/female(due to a rescue I couldn't resist!) Now with the three pack it is female/female/male. My next dog will probably be female but not until the other two are either gone or elderly.
I like both, females are more serious, males are goofy, yet when mature are more assertive. I think it is an individual preference, and changes according to what is in the pack at the time.