We just started with chicken about 2 months ago. We have a Rhode Island Red, a Delaware, and two Australorps. The Red is by far the loudest followed by the Dela. The Austros barely make any noise. The four of them have picked the ground clean but we feed them veggie scraps and they dig in. Not too sure about the quality of the eggs as we don't have capture nests, just a single box.
The chickens are awesome. Good find and good luck with them.