The WhisperFlo has more braking HP (BHP = HP *SF) for less current. This means it is a more efficient pump and GPM/KWH is higher than the Hayward so I would vote for the WhisperFlo.
However, the most efficient pumps I have seen are the Hayward Northstar line of pumps. The 3/4 HP has a service factor of 1.85 and draws 11 Amps @ 115v. The highest BHP for the current and one of the best GPM/KWH. This pump will turnover the pool faster than the Wisperflow with about the same current.
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