I butchered my first 2 chickens this weekend, a dark Cornish roo and a Faverolle hen, which are both heritage breeds. Both the same age prepared in the same way. The Cornish was much bigger and meatier, a bit chewy, but very nice in flavor. The Fav girl was smaller, but she had a deformity which may have been the reason for that and was also the reason why she was butchered, but oh man, that was the most amazing tasting chicken I have ever had. The meat was much more juicy and tender then the Cornish. My Cornishes are much more skittish and nippy then the Favs. So there is my input as far as taste goes, though I will be trying out several more breeds this coming spring to test out more meaties, but as pets my Faverolles are the best and the taste was incredible.