thanks @shurite7 - helpful post, gives me an indication that the tech-style fins a la RK3 /Jet won't be the best if I want a fin suitable for current.
With the hinge fins like Seawing Nova, I did hear it wasn't great for close control - ie maintaining position close to some coral for photos then backing out of there, and I wasn't sure if the positive buoyancy on those might be a bit much for a 7mm wetsuit...
Don’t get too caught up in the idea fins are a solution to control. Learning different kicking styles is key to knowing which fin to use in certain situations. I can swim backwards in split fins, but they don’t work that great. Jet style fins work well in currents, its just they tire one out if you have to kick a lot. When it comes to currents usually you go with it; I had swim against it (mountain streams and rivers) at times when looking for evidence or a body, therefore I preferred the Nova Fins.
When using my video camera and diving with a drysuit in cold water the Jet style fin allowed me to have a lot of control with using different kicking techniques. In warm water, some videographers prefer the long free diving blades that allow them to swim with smoothness and speed. It is a pain owning multiple fins, some fins work well compared to others in certain situations. Again, mastering fin techniques is the most significant part.