I've had the good fortune to have enjoyed fish from lots of diffefrnt places and the Yukon king is pretty hard to beat. those fish have a pretty long trek to the spawning grounds. Just to the south, the Kuskokwim, another super long river has (in my experience) sub-par kings. The best king I ever ate came out of Grays Harbour. Different fish, different diet, different life cycle, Who knows? I got burned out on Sockeye as a kid, but I'd bet those upper Snake river Sockeye were pretty darned good.