Which prop?

Whatever prop works best with your engine, on your airplane, at your field. And "which prop manufacturer" has so little to do with it, it's almost funny to hear the question again and again.

It is always worthwhile to try different diameters and pitches. It's also worthwile to try different shapes. And it's worthwhile to try different stiffnesses. To try all those requires that you buy props from different manufacturers. And if you do that, and have a chance to work out the right prop for more than one model, you'll see that diameter and pitch are the most important considerations.

BTW, the rpm you get on the ground means little or nothing.