Nothing outfishes an 11 inch flasher. That is not even debatable. Color does matter, but not as much as other things. They are coming out with new color/tape combos every year. The new glow stuff is good but different boats fish differently. As far as species, cohos are dumb and bite just about any color flasher. You can improve your king score slightly with a different color flasher.
But there are a lot of variables in catching kings and flasher color is one of the more minor ones.
