My 2 cents CDN . I cast better if I can see the line so I use bright chatruse floating line , which tends to make my presentation better . I use the longest leader I can . I have had the fish strike the leader/flyline knot on more than one occasion . Anything that helps your presentation will improve your fishing IMO . Everything changes tho when you go to a sinking line . I use as dark as I can get because I fish in dark coloured lakes .