Orpingtons are skinny/boney in comparison to Red Ranger or Murray McMurray's Big Red Broilers. The Orpington roosters take 5 months to reach 4 to 5 lbs and Red Rangers or Big Red Broilers get bigger than 7 lbs in just 12 weeks. In addition the Red Ranger and Big Red Broiler are good jumbo egg layers.Would you say Rangers have more dark meat than Orpingtons do, relative to body weight?
https://www.mcmurrayhatchery.com/big_red_broiler.html