My own thoughts on this are that surface and slightly subsurface takes with a floating line happen faster and obviously have less line/water tension. The take in general is felt by the angler much quicker. The fish are generally hotter as they have moved up in the water column to eat the fly. These are the kind of takes I think most everyone prefers. As the fly is sunk deeper in the water column on heavier and heavier tips, water tension on the line slows down the time between the fishes initial grab and when that grab is felt on the rod end. The grabs on a deeply sunk fly can be violent as well. The weight of the line and tip in the water is also a part of that arm yanking deep weighty pull that we all love too. I don't know, each grab type from the above list all have their appeal. I like them all, the surface is probably my favorite. A visual signal coupled with the instantaneous connection is pretty hard to beat. What do you guy's think? What's your favorite grab?