[joe_padavano]

I'd use the clutch fan. Electrics for the most part do not move as much air as a mechanical fan. Also, there seems to be a fallacy that electric fans don't put as much of a HP drain on the motor. The reality is that moving the same amount of air requires the same energy, and that energy ultimately comes from the engine. The difference is that a mechanical fan is driven directly and an electric fan suffers the conversion efficiency losses of converting mechanical energy to electric and back to mechanical.