Another interesting point to compare, is the military doctrine. The contemporary Chinese at the warring state China, if they could wintness the Alexander's Perisa campagne, would feel odd. The first question might well be, "Do Alexander and Darius have to fight the battle themselves"?
When Sun Tze wrote his famous Art of War, it's still the routine in China for head of the state to go to battle himself, command the troops or fight himself. But at Alexander's time, it's a phenomeno long gone in China, the king didn't go to the front, he sent general and staff to the battle field. And even command-in-chief didn't fight, in the biggest battle fought between Qin and Zhou, the first command of Zhao troops was an old man close to 70.
That refects the bigger, and more complicated warfare scale and need for head of state kept away from the battle field, since he was the central nerve of the whole country. In the battle Zhao suffered 450,000 causalties, but King of Zhao still could organize efficient resistance to Qin troop's advance, delayed China's unification for another 40 years. In Alexander's war, Darius fleeing casued his troops collapse, in India shortly after Alexander was wounded by an arrow, the war stopped. But neither of them would happen in China, Chinese depended much on institution instead of on individuals.
