This is literally an impossible question. I mean Dragon Ball Universe has a pretty solid foundation and explaination for various characters' power. We understand how strong Goku is and we can estimate his power. However, in One-punch Man Universe there is still no answer for Saitama's power, no explaination, no clue, nothing. Through out the series, we only hear that Saitama possesses unknowingly tremendous power, we don't have anything to estimate his power and so I dun think comparing Goku and Saitama is legit.