In very general terms, wider chord propeller blades were intended to be better suited to four strokes with their higher torque and also were intended to work well with longer stroke 2 stroke engines that also tend to have a little more torque than the average short stroke two stroke engine.

As an aside, two bladed props tend to offer better cruise/top speed performance due to their improved aspect ratio while three blade propellers tend to offer better low speed performance due to better disc loading at lower speeds.

In general, R/C propeller efficiency has been pretty low - maybe 50% - compared to a full scale aircraft expectation of 80% prop efficiency. However the newer generation propellers and APC's new props in particular are reported to have an 80-85% efficiency. This means a lot more performance. So you really need to just experiment with several types as well as with pitch and diameter until you find a prop that works best for your particular aircraft, engine and type of flying.