I just finished processing a Barred rock, buff orpington, and 8 dominiques. Last summer I processed 6 cornish X's. In my experience, which is limited, I will say the cornish X were much easier to clean and raise. I hear alot of people say the cornish X's are more work but I don't think so. They were my first meaties ever and I did everything wrong and I still got a wonderful result. They seem easy to me. The heritage were pretty easy too, but I had to keep them much longer (which means more work), they were much harder to clean and ate sooo much more than my cornishes. Now granted, I have very limited experience, maybe in large numbers there is a huge difference. I think cornish X's are very easy, I had zero issues. That being said the heritage did taste different, but I haven't tried the doms yet. The Barred rock I ate had huge breast portions and the breast meat was delicious, the legs were a bit rubbery but that was my fault. I am still learning all this too. I processed a cuckoo maran last summer as well and the taste was very good. Hope this helps.