I think that the vast majority of high end surf style boards have some type of removable fin system - such as Futures or FCS. The mass produced low end surf style boards use wakeboard style fins beacuase they are cheap and easy to install at the factory. Many skim style boards use a single wakeboard fin in a trailing position and I'd think in a single fin setup that is the best option.
The Walzer was pretty innovative during it's short history of production. One of the things they brought to the table was the use of the C-5's as rail fins. The C-5 fins had a great foil and the Futures "Vector foil" inside cup. The fins were pretty good at generating some drive for their small size. In relative comparison to wakeboard style fins, the base was much shorter also, making the C-5's loose and quick to release.
Additionally the C-5 boxes allowed a little bit of fore and aft adjustment, not a LOT, but enough to feel the difference when riding. You can see the "gap" in the picture below. Lastly, the fins installed with about 6 degrees of cant, providing some lift and also a more aggressive turn compared to a fin without cant.
The first Walzer Alpha's were really very 'techy'.