So def a difference in the two.
The Fanning fin has less area through the rakiest section of the fin into the tip.
You can definitely feel the difference.
Fanning fin is so drivey, smooth and so natural feeling - IMO the best feeling fin on the market.
I've ridden both the large and med DHD Futures as well as Large DHD Futures with med DHD Futures as a trailer. Def a great template and drivey but different.