Back in the day Frank Zaic did some work on this topic as related to free flight models. He determined that with a low pitch/diameter ratio that it's far better to stop the prop than to let it freewheel (even if you were to use a decoupler) but at high pitch/diameter ratios where the blade angles are up around the 45 degree point that freewheeling is the better option. The range of ratio of pitch to diameter where the transition occurs is around the 1 or 1.2 pitch/diameter point. And with the optimum ratio for rubber flying being up around 1.2 to 1.4 this is why so many rubber models used freewheeling before folders became popular.

Of course a lot of power or electric flyers won't be aware of this since it's not common to use model sized props with ratios even as high as 0.8 let alone 1.2 to 1.4.