I have hatched with an incubator/brooder in the house and with a broody hen out with the rest of the flock. My indoor babies are now 9 weeks old, my outdoor babies are 6 weeks and their mum has just left them to sleep with the adults at night and started laying again this week. Of the two groups the younger ones (the outdoor chicks) are much more confident around the older hens. They seem to have been accepted as part of the flock (although there is the occasional telling off!), while the indoor chicks are still very much a minority group. They wait till the adults have finished at the feeder before approaching and move away if an adult hen approaches them.
Much as I love watching the hatches in the incubator I will be using broodies as much as possible in future!