As most have already said, for me it totally depends. Coho go to is a very fast retrieve generally, single or two handed. SRC go to for me is a steady, fairly fast single hand strip. If I’m not getting the response I want, I start adjusting speed, type of retrieve, etc. In winter, if SRC are not being aggressive, I often fish so slow I’m ticking the bottom nearly every cast. I also often switch to more natural flies - color and style wise. Don’t get frustrated when conventional wisdom is not working. Catching SRC and coho is very easy….when it’s easy. Both species can be crazy aggressive and many days it’s more about finding them than technique. As much as I love it when things are easy though, I get waaaaaay more satisfaction when on a tough day adjustments and experimentation with retrieve, flies, color, etc. lead to hooked fish.