Dante was forced to make this choice in a very small frame of time, given that he was in the middle of an active battlefield. The cacophony of sounds, like metal clashing, horses neighing, people cursing, screaming, or begging, all sounded in his ears and seemed to scramble yet also focus his thoughts.
The young man thought of his upbringing, his thoughts on killing, human life, and how to treat others. He thought about his chances after acquiring his superpower and everything that happened afterward.
His mind cast onto his loved ones, what they would think of him if he made either choice, as well as what he would do if someone harmed them. He thought about his captives on Earth in the icy cave within McDonald's Island who were waiting to be fed by him.
He thought of Ulysses, the Pantheon, all the forces hidden on Earth, and the various forces of the home universe that might stand in his way of conquest.