Over a decade ago, a cooperative LDS let me take a pair of every fin they sold to the pool. The Mares Quattros were best or a near second best for frog, flutter, and dolphin kicks (and best for the frog kick). What were the other fins? No clue. However, I have since tried jets and turtles, and found them not to be as good--for me. Remember, this is sports equipment. Everyone's legs and musculature are different. At the "hey, this is OK!" end will be a lot of solutions. At the "this is best" end, the solutions will narrow sharply and differ for different people.