Most people have males because they like the idea of hatching, others get males because they buy straight run ducks, then some think you need a male for eggs. They are happy with more of their own kind. So all ducks and all drakes are happy flocks. Avoid more drakes than ducks, it's bad for the ducks.
Most of the time drakes are more colorful than ducks, so that is also at times a reason people keep the boys around. Our silver appleyard ducks are just as pretty as the drakes. The Khaki ducks are a stunning chocolate/khaki color.
I am forever updating our farms website, with photos and info, feel free to look around at the pictures.
Good luck on your search, no matter what breed you pick it will be the one that appeals to you, or is best for your location and needs.