I think it kind of depends upon the purpose for your flock. If you want to improve the breed then one might be good to focus on. If you want some egg layers, some meat type, some eye candy, then go for whatever makes you happy, but I am no expert by any means.I'd like yours & others input about me having one Heritage Breed or one or two of 4 or 5 breeds. Thx ahead of time. I'd like to go somewhere fairly close to pick up some juveniles.