We should consider the different disciplines if we are to compare Bi-fins and Monofins.
In constant weight i'm pretty sure no one will argue, that the monofin is far more efficient because of the greater accelerations it provides at the surface, when figthing positive buoyancy, and at the bottom, when figthing negative buoyancy.
In dynamic apnea the case is different, there are no buoyancy changes and therefore people tend to choose the monofin for its higher efficiency at greater speed, or stick with bifins mainly because it allows a relaxed swimmimg position with arms at the side when swimmimg quite slowly.
Christophe
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