As far as I know, the less blades you have, the more time it needs to accelerate. With more blades, the prop radius will decrease (for the same efficiency), and you'll improve the prop time of reaction (especially with light synthetic blades, compared to metallic ones).
On the Bell helicopters, the two heavy blades are a good point for the autorotation, due to the rotor inertia (the blade tips are metalic). But in the other hand, when the rotor looses some RPM, it's more difficult to re-accelerate. Short radius-multi blade prop is like a low gear in a car, and a long radius, with few blade prop, is like a higher gear.
On some planes, they increased the number of blades, and also their shape. Maybe it's because with 4 bladed props, the blade tips are close to the speed of sound during cruise. By increasing the blade quantity, you'll reduce the prop radius, and the tip speed. From that, the plane can fly faster.