Kinshiki. A lot of Momoshiki's strength lies in his absorption, and that absorption is pretty useless vs Kinshiki. I feel like Kinshiki is stronger in taijutsu, but Boruto is really inconsistent when it comes to characters. One moment Kinshiki has the speed to pressure Sasuke and the next kages are evading his attacks and trapping him. Same with Momoshiki.
His physical capabilities significantly exceeds Momoshiki's. The DB hypes him to be powerful enough to physically split literal worlds that implies he possesses equatable physical power pressure to accomplish that when assimilated with that of his axe, then there's the fact that he can physically eviscerate Momoshiki if the fight approaches CQC distance, seeing as he's visually displayed to be a physically inferior shinobi by a significant quantity.