When we started out thinking about meat birds we heard about so many challenges with Cornish X that we kept looking. For ethical and practical reasons, we wanted a bird that could live a normal healthy life, would actively forage, didn't have a short processing window, and could reproduce.
We started with Freedom Rangers and really liked raising them. They taste great and we've processed them at a range of 10-13 weeks. We have plenty of pasture and can fit three batches of meaties into our season. It works for us. I have looked into red and black broilers but all the hatcheries I talked to said they would not recommend keeping them over for breeding. We have one-year-old Rangers that are reproducing what so far look like pretty good replicas of the parents (oldest are seven weeks now).