What is your objective? speed, scale looks, reducing prop strikes?
Two-bladed propellers are commonly used because they are relatively efficient, adding more blades decreases the overall efficiency of the prop because each blade has to cut through more turbulent air from the preceding blade but sometimes 3 blades are an advantage for the scale look or in my case I use a 3 blade on my float plane with smaller diameter to reduce prop splashing water on my FPV camera lens during takeoff
this did stop the water issue but did eat some fight time, on some models fuselage and ground clearance issues might dictate which propeller size you can use on the model. As with everything, trial and error ........so test and test
when choosing a three propeller, over a two bladed one, there is a general rule ...... to decrease the prop diameter by an inch and increase the pitch by an inch,
now a watt meter to be certain your not over working your ESC or motor is advised, at the very least use a thermal gun to test your ESC and motor temps to be certain your not overloading & over heating the electronics
as to fitment buy a prop with the adapter ring spacers that fit many prop shaft diameters
I like Master Airscrew props with my 3 bladed prop choices