Is it better to use pneumatic tires for bicycles or pu tire-less tires?

Inflating is still good, very comfortable, with great cushioning force and partial shock absorption. The disadvantage is that you have to repair the tire after puncture.

PU wheel is hard, and basically has no buffering force, and all bumps are transmitted to the rider. The advantage is that it is not afraid of pricking.

PU wheels are suitable for riding with very small wheels, and the speed is relatively slow, because there will be much less bumps when the speed is slow. For example, polyurethane wheels are often used on bicycles.