I have had the pleasure of shooting over some fine dogs in recent years. I can tell you that stats show that more FC's (which is where a lot of the breeding stock comes from or are related to) tend to be males. All breeds across the board.
Personally, I prefer females because they tend to train up easier and tend to be a bit more willing to please until they near their cycles. If you have her spayed before then you may not get the middle finger from your spiteful huzzy when she gets PMS.
Having said that, I have a 15 month old male who is training up nicely and shows much promise. He may make me eat my words one day and if he turns out like he should then I will savor every bite. On the other side of the coin, you have to consider your male when he wants to be Romeo vs. hunt when your buddy's female is in season during bird season.
We have had 6 females to 3 males. Our next will likely be another female.