Mismatch. All might stomps both Rounds. All might is too strong and durable. Asta is op in his verse because they’re so dependent on magic. Asta can’t hold All mights jockstrap when it come to H2H fighting
I've only watched the anime of both, but I would say Allmight stomps. He can't cancel out Allmight's powers, so it comes to physical strength vs physical strength, and Allmight is just much stronger than Asta is.