If anything the red kings are better... some white king I have had was pretty earthy tasting.
I know chums are a different thing but I suspect they also get their color via some similar food sources. And while there are several factors which affect a fish's attractiveness to flies when dried in the open ambient air, whatever the very red-fleshed chums eat seems to more interesting to the flies even when those fish are cut and hung while still in rigor.
