Props are air foils, there's different series of the same brand you can buy.
It also depends on what type of airframe you will be mounting a prop on.
Obviously you would prefer a larger diameter prop for a model such as a YAK or Corsair becuase of the bulky cowling.

A prop also acts as a torque converter or wieght that an engine require to run or rotate.
It is recommend that you put suficient load on an engine, to prevent it from operating beyound it's deisigned operating rmp therfore prevent damages to the engine.

Different engine will have dfferent peak power band. Peak RMP dosn't necessary mean peak power. Once peak HP threashold have been achieved, the HP
will drop if the rmp continue to climb. In other words..you'll just be making prop noise and not peak power at peak rpm.