Out to 40 feet or so I find very little, if any, difference. 40 to 90 feet (pretty much my limit), WF is an absolute advantage. especially in shooting line. Some extreme distance casters like DT because they use the entire line as a shooting head. I have never seen this but I have heard it can be done. Only my small stream 4 and 3 wt have DT. I really don't know why brcause I usually just buy a new line rather than switch ends. A new gizmo or a differend color, maybe. Maybe tradition too, I guess.

Bob