I would add a fourth group - open air with commercial feed and as much range as they care for daily. Those would be my 16 chickens. They have a converted horse stall coop in an old barn. The other stalls and the barn alley are their indoor run. The PulletShut door on the coop opens and closes with the sun, I open the barn doors some time later depending on the season. I'm not up with the sun at 4:30 AM and when there is snow on the ground they choose to stay inside so no rush for me to go out in the cold. They have free run of the coop and barn alley all day and unless we have to go somewhere for hours, ~ 2 acres which includes the pond, house and barns that they choose to stay within about 100' of.
In the summer I go through about one 54 oz applesauce jar of commercial layer feed every 3 days (assuming I don't leave it out all day for the woodchucks to decimate). They forage bugs, plants and whatever else they want and eat the commercial feed. They get a bit of BOSS and kitchen scraps every morning and some scratch at roost time. In the winter the feed goes to about 1 jar per day given there is squat to eat outside in the snow. The concept of fully free ranging layers would be a joke in Vermont. Summer? Sure, Spring? Not until April/May, Fall? They would be hurting come November. Winter - HAH! Dead chickens. Free range summer broilers? Yep that would work and probably make for a healthier bird.
There is NO question that the yolks of my birds' eggs are much more yellow orange than battery cage eggs even in the winter. I have no idea about the nutrient content, the girls do not follow labeling laws.