Rails are a critical aspect of board design and many board manufacturers and builders fall short in rail design. Consider the rail to be your attachment point to the wave. A sharp rail will be very fast, user friendly and capable in building speed, and attachment.  Rounder rails are "stickier" due to surface area, but generally are slower and less involved in directing performance.  Round rails rely more on the fins for direction changes and speed generation. A tucked rail promotes pump drive but also works in the "lean on the gas" for speed. Tucked rails are the best of both worlds in attachment and speed generation, however for novice riders, a tucked rail can hold a rider back when not ridden correctly, making the board feel slower when not matching the rails performance envelope.

Choosing a fin setup is a personal decision for each rider.  Some prefer Twins to suit their riding style surfing, while others like Quads. Twins typically are looser and faster in speed generation (less drag/locked in).  Quads are more locked in - promote stability and directionality - and can improve drive in pump driven aspects with correct fin selection.  With one of the excellent fin templates from Futures Fins, riders can dial in their surf board to match their personality.