I think Copper River salmon is an great marketing plan. With that said, the Copper River sockeye I've had has been the best salmon I've ever eaten. Columbia River springers are a close second.

However, IMHO not all salmon are created equal as table fare so a comparison between sockeye and chinook is inappropriate. My order of preference is; Sockeye, Silver, King, Pink, Chum. Also keep in mind fish that are well take care of and fresh from the salt will taste better too.