ASYMS - They're quirky to look at yet fluid surfboards to ride. Subtle tweaks to rail lengths, rail profiles & rocker make the asymmetricals I've been experimenting with work well with high performance surfing in mind. Personally preferring having a twin fin under my toe & a quad under my heel. Each side of the board is different to the other yet blend together to suit the differences in weight distribution.
This results in twin like speed yet more control on your heel side rail.
Me - Asymmetrical. Image by Ryan Haywood.