Since kinetic friction is lower than static friction, and a sled in motion experiences kinetic friction whereas a wheel experiences static friction, which one would go down a hill faster. Let's have a hypothetical scenario where we have a slope which both a sled and a wheel are stationed at the top of, considering all things equal, other than kinetic vs. static friction, which one would get to the bottom of the slope the fastest.
In this case the mass of the two objects is the same, the air friction is the same, they experience the same amount of gravitational pull, the surface has the same coefficient of friction for both objects, the surface stays at the same angle for both objects, and the rolling momentum of the wheel is negligible. Only rule is that the wheel rolls and the sled slides, so there is no slippage of the wheel rolling and there is also no tumbling of the sled. Intuitively I think that the sled should be faster as it experiences kinetic friction which is lower than the static friction experienced by the wheel.