Zamasu is one of the strongest Dragon Ball characters of all time! His power is unprecedented and the same goes for all of his other stats. There are very few fighters in all of the cosmos who can stand up to him. Fortunately for Goku he is one of them. Goku’s power level is almost infinite and he grows stronger with each new arc. He has his Vegito and Gogeta forms at the ready as well so while Zamasu will put up a good fight, Goku will be able to win this round. Goku wins.