I have never had Australorps, but I have had Ameraucanas as well as Easter Eggers. They are good layers, however, seems they skip more days than the BRs and are more likely to stop laying for short periods. Their eggs are generally smaller than the BRs, but age has something to do with that, too. You are more likely to have a broody EE or Ameraucana than a broody BR. And I adore my BR roosters. Dutch, my main flock rooster, comes when called and stands still to be picked up--such a baby he is! I recently sold six BR hens and one BR rooster to lockedhearts. They never stopped laying when they moved to her place.