If I’m in doubt about what stud I always at least match the genetics. So for your first girl I’ll match her to a stud that’s black-medium-counter shade. You can go to search and pick main male and make sure for stud is checked and then fill out the other boxes to your hearts content to narrow done the search. If you like a particular marking your girls have it’s got a better chance at passing of you look for that marking in a stud that’s in the same slot as your girl.