Yo quick question if i was to write a side story or prequel who would you want to see one based on?

ive been considering it lately. I mean I think anyone of these three would make a great protagonist for their own story and it would also be interesting in their own way. 

For one Augustus controls the current story. Everything started from him. Also his story would take place during the war and would be completely different from Miko's since Augustus never shows hesitation to do anything he wants. He's also indifferent to must things so he doesn't really has anything that could drag him down unlike Miko. 

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Then there's Nero. His story would take place when Proxies ruled the world with an iron fist. It would show how heaven-defying he was and how carefree he was during a chaotic world. It would literally be him against the heavens, hells and earth. 

Then there's Nova. His story would take place after Nero conquered the heavens. He would forever be compared to his father no matter what he did. He would try everything to step out of his father's shadow and make a name for himself. Also it would show how messed up his mind really is. I mean Nova is seriously messed up. To him allies and enemies are nothing but disposable pawns. I'm serious when I say that he has a couple screw loose I just haven't shown it yet. 

So which story would be better? Keep in mind that I won't write these stories right now.