Also remember that length of a tube/ hose is also important for restriction. Just how much power to you anticipate? If you think you are on that edge, you can actually run "let's say" a 3/8 tube/ hose system, but still use the 5/16 sender with little restriction for that short length.
Pumps will make a difference, as well. A rear electric pump is going to suffer much less loss pumping into a 5/16 tube than an engine mount pump trying to "suck" all the way from the tank. This is simple. It's because pushing the fuel is at higher pressure than trying to suck it, so the loss is not as great an effe