ORIGINAL: jester_s1

All you can really do to decide is fly the plane with both. Even if you have top RPM numbers that doesn't tell you everything, or even nearly everything, about how the engine will fly the plane. Since it's only 4 bolts to switch them out, I'd take a day and run one with a few different props and then run the other one with a few different props. They'll accelerate differently, run differently on the top end, will probably like different props which affects the torque effects that your plane sees, will vertical differently, and will generally have a different feel. It shouldn't take long to decide which one suits your flying style the best.