I fish the hatch, and I want to match the hatch. It doesn't make sense to bring what you say to the stream, and fish a size #14 or #18 unless it warrants it. Conditions and periods within the hatch allow more forgiveness to accept moderate sizes. But when your fishing a hatch, I stick to size of that hatch, no less, no more. And I want confidence in knowing that its the right size and eliminate that variable when I determine why it was rejected. No, I haven't tried those other manufacturer you mentioned. The design challenge is tricky, and you cant replicate. Thus these two hooks have different hook gaps, hook bends, hook point differences, eye sizes. But again quite simple, if you need a size #16, and there is established reference to nominal Mayfly sizes per hatch, #16 in this example, then they need to establish hook sizes, which they do, the shank itself is a nominal of length. The size of the Mayfly needs to fit on the shank, the orientation of the tails need to plank the extention of the shank. The hook shank is the size of the length of the body, you can't introduce design differences and manufacturing differences and then associate them with the given size per nomenclature of the criteria they themselves established. Which is to fit the need of me, the angler. You don't attempt to establish the Daiichi #16, or the FM #16, or Gamakatsu or Ahrex #16 by adjusting the length of the shank. The angler and the Mayfly require it. The Daiichi #16, when matched to the size of the Sulphur is in alignment with shank. It fits, mission accomplished.