For sheer fight and fast runs hard to beat fresh run sockeye on a light to medium fly rod. Fresh run sockeyes are great eating- one of the best. But.... they require somewhat of an acknowledged faux fishing technique once they get into freshwater. Adding a "Russian River Special" fly to the end of your line is simply covering the truth about how they are actually caught... adding the fly simply makes it "legal"... if the hook ends up inside the fish's mouth
Truth and reality?.... it is simply called "lining"
Find a shallow stretch with sockeyes running up. Cast fly line above and across running fish. Tie on a "fly", matters not a whit what kind, on short heavy leader, weighted fairly well to get line down to fish level. Draw line across fish and toward you. An unlucky sockeye will get the line/ leader into its mouth. As the the fly is drawn to you, the fish is snagged... and if in the mouth, it is considered a legal catch. Jerking the line as used in snagging salmon is not legal for this "fishing" and wardens have seen it all and heard all the excuses. Amazing the subtleties and deceptions illegal snaggers use in trying to hide the jerks of the line and rod required for snagging
Anyway that is the reality of sockeye fishing
In contrast, cohos (silvers) can be quite aggressive in taking lures. Sometimes if they get crowded into small pocket water they will hit anything dropped in on top of them, even the ubiquitous, darned near obligatory Pixie spoon
My favorite lures for cohos are jigs or spinners. Just depends upon the mood of the fish. Twitching a jig is usually a great technique for fresh running cohos just in out of the salt water. Once in a while, I'll use a fly rod for cohos and tie on a big weighed leech fly of some sort. If they are holding at the head of a big hole, it's kind of fun aggravating them into a strike. But in big water wrestling cohos on a fly rod becomes not fun and, for me, not the best equipment. I like a medium weight spinning rod with 20 lb braided line.
Pics of favorite lures and some cohos. Fresh run salmon usually still have sea lice attached for a couple of days into fresh water for up to maybe a couple of weeks. Sea lice are a good indicator of how fresh the run is. Cohos are excellent eating, grilled. Of course some days there's just as much enjoyment watching the river, the bears and enjoying a Grouse.