I'm new to chickens and have only harvested 2 birds so far. My flock was acquired last summer in exchange for felling a half downed tree. 3 red sex links of unknown age (maybe 2-3 years?), and 7 POL pullets. I was told they're Wyandottes but they aren't. Columbian Rock most likely?
The "golden comet" was not a big bird. She was being a terrible bully so crockpot jerk chicken seemed appropriate. I did brine her before slow cooking. Not much meat on her bones, but I much prefer the flavor over store bought chicken. As in there actually is flavor.
The second was a pullet, about 7 mos old, made a much larger carcass. This was also brined, then roasted. I found the meat to be tougher than preferred, but still good. Still a great flavor.
I will add the caveat that I'm only feeding 2 people. We don't dislike "gamey" meat. We prefer dark meat, and I'm super inexperienced. I hope to improve with more otimal breeds and age of slaughter. I do plan to stay with dual purpose breeds/mixes. I will continue to harvest older birds for meat even if nothing is optimal because that's why I have chickens!