There is so much more to prop design than just what RPM it will do on a bench. The only way to evaluate it properly, as Jim said, is to try it under the conditions you are trying to achieve.

Take for example, CL stunt. One prop will give better accelleration out of corners than another. One will cause less wobble during maneuvers, etc. AND...what works on one plane/engine may not on another. Some flyers are so knowledgeable that they can tell when and how to change props in different weather conditions...unfortunately, that is still outside my skill range. []

George