I'm going to guess that most
heritage breeds are good for eating, why else would you keep 'em around? So you may want to consider more criteria.
I raise Royal Palms:
Why? Because they are tasty, good at foraging, hardy, and can rear their own young. And they're striking.
There are a good size for a family of 4 about 8-10 lbs dressed which is all I need for Thanksgiving, one day of leftovers, and soup. Also, they're light enough for me to handle slaughtering myself (whimpy lady?).