I don't have any definite plans for processing. I've only got 8 and I'm seriously considering keeping a couple of hens to be bred with either a Colored Ranger (if any can do the deed) or a Delaware. So, I might keep them a bit longer than you to better decide which might be kept.
I think I've read that you will do Cornish Crosses if you do meat birds again. If I buy meat chicks again, I might do the same. I had 12 Cornish Crosses this year that were a week older than the Colored Rangers, these were processed at 8 1/2 weeks. They didn't act much like a chicken, but they were very efficient at what they were created to do: grow fast and large.
My first choice is to be able to breed and raise my own meat birds. But, if I am unsuccessful at that and the choice is between Cornish Crosses and Colored Rangers, I'll probably opt for the former because they are more efficient at feed conversion and take less time start to finish.