Jim & Zzz may be correct, I really don't know. I have some issues with the report however.
In the body of the article under the fins image there are some graphs.
Avanti Superchannel:-
Speed... 2.1mph, Thrust... 36 lbs. Slalom... 71 seconds
Quatro Excels:-
Speed.... 2mph, Thrust..... 38lbs, Slalom... 69 seconds
My 1st thought, how does a fin producing less thrust have a higher top speed & with more speed take longer to do the slalom. Also the null hypothesis would be proved when comparing the performance of these fins.
Then I saw the summery box at the top of the article.
Avanti Superchannel:-
Speed... 2.4 mph, Thrust... 41 lbs. Slalom... 55 seconds
Quatro Excels:-
Speed.... 2.3mph, Thrust..... 40lbs, Slalom... 62 seconds
My conclusion, the author either has no idea haw to analyse & present data, there are mistakes somewhere, he's incompetent or has some agenda that has nothing to do with presenting factual non biased information.
Having said all that, & if I accept the averages presented in the body of the article. There is no statistically significant difference in the performance of these 2 fins. Therefore the price v's performance equation falls heavily on the supperchannel side.