Every discussion of fly rods and lines pretty concludes with, "the only way to find the right one is to try them out yourself because everyone is has different physics, style, and purpose". So, ideally, there would be a shop that has 5 different fly line set ups of the same weight, all lined up on the same reel and same rods, and a spot out back where one could safely make some casts. Conversely, they'd also have 5 different rods, of the same weight, all with the same line and reel, so you can get a side by side comparison of different rod brands. Does this mythical place exist? I've never been to a fly fishing show. Maybe they regularly have such displays. I'd pay a small fee to spend 15 minutes to actually learn my gear preferences. Or even promise to buy my rod/line from the shop that did.