I would say that alot of people cycle through about a dozen attractor patterns that will probably work 12 months of the year on the bow, sometimes thay are a little pickier than others, thats when you need to use a specific fly as to what they are keying in on, I totally agree with Hawgstoppah`s definition of presentation and how it affects the number of hook-ups. There really is no secret flies, just secrets on how you use them.
just my opinion.