Most say females sell easier, because more than one can be housed together. But I think as high end stuff goes most want a male, so you can breed him to multiple females
Most people want to incubate for females because they are easier to keep together and buyers often want females. Personally, I plan on doing a 20/80 split with my eggs, favoring females. I still want some males though, for people looking to buy males, and in case I want to keep a hold back to cross breed with a non-mother female. But it's really up to you. 80-84 is mostly female 87-90 is mostly male and 85-86 will give you a mix. Good luck!