Again, depending on how and where you hunt will determine which motor is best for your style of duck hunting. The two main configurations for duck boats are conventional (think standard long shaft propeller outboards) and mud motors (both short and long-tail varieties). Selecting between the two comes down to the environments that you hunt. If you only hunt shallow water, mud motors are ideal. If you hunt deep water, conventional outboards are perfect, and if you hunt both, choosing between either is a little murkier, but short-tail mud motors will likely satisfy your needs. A better explanation requires a much more detailed article, but following these guidelines is a good place to start.