Lloyd (LL21) uses both
I am not sure he has figured out which one contributes most. Maybe both approach's yield similar results ? I am happy where I am. I prefer the cleaner look of an rca going into my components, rather than a wired spade into my chassis screws. The way the sound is now using these devices, I am not sure I can do much better. I may have reached the ceiling of what is possible in my system....