My response will be short. A fin review is only as good as its evaluation criteria. One of the best historical models of fin comparison is the US Navy Experimental Diving Unit 57-page, table-filled report "Comparative evaluation of swim fins" by W. G. Fischer, published in March 1957 and available online at
http://www.dtic.mil/dtic/tr/fulltext/u2/780665.pdf. It begins with what is scientifically measurable, including internal and external dimensions, buoyancy, hardness and stiffness, rather than leaping to subjective "approval" ratings as the decisive factor. I wish all modern fin reviews emulated this approach.