Well, at this point I've had an equal number of each, although on larger birds, it leans to more females. As far as personality I'd say I like both equally. I've not any problems (yet) with egg laying or egg binding, so I try not to actually worry about it.
As for other animals, it depends:
House cats, prefer females; outdoors it doesn't matter to me
Dogs: prefer males
Horses: prefer mares (females)
Rodents: prefer males
All other animals I've had I can't say I have any preference