Noooooo! Rome's peak of power was under Trajan.
"Noooooo! Rome's peak of power was under Trajan."
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No fooling. There was a brief period of prosperity when Constantine reunited the Empire during this time, but the glory days were the rule of "The Five Good Emperors" ... Nerva, Trajan, Hadrian, Antoninus Pious, and Marcus Aurelias.
That was the peak of Roman expansion, anyway. That said, 320 probably makes for better sightseeing in Rome itself. Less brick, more marble, more looted swag, better wonders.