Debi, Liked your post! How nice to have a group to do the work together.
Dorkings historically were known for their meat qualities, but they haven't been bred properly for so many years that the breed is not what it used to be. That said, I just had someone pick up some eggs & birds from me who said that he had Dorking in France that was the best chicken he had ever tasted. There's a breeder in NH that also says that his are superior to other chicken.
I think a lot has to do with how they are raised, what they eat, and how they are cooked. It has been a huge learning experience for me, since I was raised eating only supermarket chicken. Heritage chicken is very different from the Cornish x, which can take time to get used to. My first attempts with eating Dorking were disappointing. I still need to bring my birds up in size, but I've learned a lot about how to cook them.
The last Dorking that we ate, we unexpectedly had company and I was worried about serving them this heritage chicken, since they are foodies. They actually enjoyed it and my husband said it was the best yet.
The breeder in NH says that his are big enough to butcher at 5 months but mine take 7 months to reach a large enough size to be worth eating. By that age, they are a roasting fowl. I've found roasting them slowly on low heat makes a tasty bird. So Dorking is not for the impatient, they are truly slow food. Maybe that will change if I can get their weight and size up to Standard.
I also really enjoy Delawares. They mature faster, are ready at 5 months for butchering. Since they are butchered younger, you can grill them or cook them with faster methods than roasting. The flavor is also very good. Again, mine are smaller than Standard, yet I've been pleased with the amount of meat on the birds. I'm hoping to get some awesome, much bigger Dels from a breeder who has recreated them from BRs x NHs. Walt says they will be the best around.
I've been happy with both breeds as egg layers. I was preferring the Dels as meat birds until we tasted this last Dork...now it's a tie.