This is true to a point the genes are the genes. Problem is you haven't seen enough to know what the expression of those genes looks like. I'm in this position a little now. I bought two pups. Both are rbjbt crosses, but looking further at it they aren't really that related. Now i see them as two different entities. One is a young male the other a female. My gut is pulling me towards the male more. He impresses me more every day. I would rather get his littermate sister. Do a father/daughter breeding with her and sit on the male. I think the males have a harder road in dogs and in life. Girls may get a pass to a point. Most likely when you are getting a start. My male may suck. Turn to be a rank cur then I have a yard full of his kids. The female may be the same. If she can pass on the genes in her past and successfully raise a littler of pups I'm happier.