When we were looking for a V, we were told that the males are more velcro/clingy and affectionate, and the females more independent and strong-willed. But like humans, I think there is more variation within the sexes than between the sexes, and there aren't firm rules. We were also told that the females love you, but the males are in love with you.
Our male is very playful, velcro, eager to please, lovable. He does bark at those passing by and noises - but greets visitors enthusiastically and with lots of love. We had almost no trouble with potty training. Our breed claimed males are easier to housebreak, but I have no idea if that is true. He has had some issues getting along with other intact males as an adolescent, but this doesn't seem universal. He rarely barks at other dogs, but he has one neighborhood enemy that he barks at.
One thing that is annoying - he pees on his paws sometimes! We have to wipe them down every outing. Not all males have this issue, but I don't know think any females would. He also likes to stop and mark, despite his otherwise very good training. I hear females do this too sometimes, but he is pretty relentless. I also have heard females are easier to train to do their business in one place in the yard. He does not hump. If you are keeping your pup intact, males don't go through heat, which is nice. But if you have two intact dogs, it is probably easiest to not have opposite sex!
I think with a Vizsla, you can't go wrong!