It is a joke but clearly Moria, even if a villain of a small arc with not so many chapters, was far better characterized than Kaido who is not only the villain of Wano (an infinite lengthy and also important arc) but the villain of the whole saga which started with Punk hazard.
Power wise it is debatable, Kaido powers with the dragon zoan, leading the 100 beast pirate crew, and his different powers (hyper beams, storms, fire dragon) are cool and at first he even manage to sound as a threat yet Moria powers are far better as originality. Either way overall Moria was the better villain due to his backstory mainly.