If you had the proper equipment, money, skill, and good reason to...… What would you pick to breed? Species? Morph? etc.....
Why?
https://www.bing.com/images/search?q...=0&expw=0&vt=0
For me it would be Neon Blue Garter snakes. Why? Endangered and would try to breed with the intent of repopulation of the wild.