Wider props will give more pulling power and less speed. Steeper pitched props deliver alot of speed, but not as much power. A 14X4W would offer you alot of pullong power witout alot of speed. Most 3D maneuvers are performed at or near stall speed, and use the ailerons, elevator and rudder more as thrust deflectors. It would be much easier to govern slower speeds with a smaller pitched, wider prop. Things like HA Knife Edges, hovers and harriers would be hard to control with a steeper pitched prop. (I didn't say they were impossible). I had an edge 540 when I was in Colorado Springs (Ft. Carson). At first I was running a 14X8 with an OS 1.08 FSR. I thought that because of the altitude I would need a steep prop. I tried a 16X4W and it was a totally different plane. A 15X6 Zinger was my second choice.