The types of battles the two leaders have been fighting are quite different. Moroni has all males because they fought an army. Ammoron has a number of women and children because they had attacked and captured cities. It is certain that there were men in those cities, but there would also have been large numbers of women and children who were unable to escape before the capture of their city. Moroni understands this, and attempts to find a way to increase the number of able-bodied men who are released.