I have one of both (Vizslas). Most folks seem to prefer females for intelligence, and thus trainability. I haven't seen that. I think she's smart enough, but she can be such a drama queen, she won't want to do something that she loves (like hold a point) when she realizes I want her to do it.
My male (5 years old and unaltered) is strong, with lots of endurance (he likes to run with me), is very loyal as I have trained him myself, loves to hunt, and has a very agreeable disposition.
Hey, ever notice how much alike people and dogs are!?