Momo may have the ability to create just about anything but that doesn’t put her in the same league as Deku. His speed is too vast and he would be able to land a counter blow at any point. Momo wouldn’t have a way to take the hit no matter what defenses she puts up. Ultimately this is why Deku is certain that he will be the number 1 hero, he has the skills to win. Deku wins.