For efficiency and performance the single bladed prop is the best but that comes with a lot of problems and thats why the two blader is almost universal on our aircraft. three and four bladed props get progressively less effective and you have to sacrifice diameter and or pitch to maintain any kind of performance.

There is only one thing dumber looking on a nice scale model that had multi blade props with a two blade one and that is a tiny ridiculous lookin three or four blade in a vain attempt to look scale.

Much better off making a static prop for display full scale and looks awesome and can be spun on and off.