Road (surface-mounted) or mountain (recessed) pedal systems?
Surface-mounted pedal systems are the choice for road racing. The stiffness of the design allows for efficient transfer of power from your leg to the wheel. They are light, aerodynamic, and provide the most direct connection between you and the crank. Recessed pedal systems are the choice for off-road and touring use because they allow you to walk around when you are off your bike. We think they are the best choice for tandem use, particularly for captains, because they provide the most secure footing, and we actually prefer them for virtually all non-racing use.