Comparison of Achilles and Herakles as Heroes

Compare the figure of Achilles (the “best of the Achaeans” and the greatest hero of the Trojan War) to Herakles, the other great hero from the Greek mythical past.

How do these two heroes compare to and differ from one another, and who do you believe was the greatest hero according to ancient Greek standards? You must substantiate your points meaningfully. Lastly, briefly consider whether or not they can be considered heroes by us in the 21st century. Some points you may like to consider are their births and parentage, backgrounds, skills, feats, personalities, behavior, relationships with others, etc.