So, do the hens have bigger breasts?
*Nope, they are pretty proportional since they will still be chicks at butcher time.
Are the roosters not as tender?
*I notice no difference... basically since they are still big babies so nobody is tough yet.
Any advantages this way one over the other?
* Only advantage is that roosters mature faster so turn around time to table is about a week less or so.
Or is it really just a matter of timing and I would gues less feed for roosters if they finish faster?
* It's just a matter of timing. The roosters may actually eat more or the same amount per body mass. They grow faster and thus eat more in the shorter time it takes to reach food weight.
From a producer stand point, many choose roosters because if you are raising successive batches, saving a week or two per batch means you can put in an extra batch for the growing season.