In fact FishinMagician, a white and a red will more than likely have an very similiar or even identical diet.
FA referred to a missing enzyme...when present, that enzyme allows for absorbtion of the pigments that give shrimp their orange shell; it is solely (not the flatfish) that missing enzyme that is the cause of a "whites" pale flesh.
In terms of their table fair, I killed them the first 2-3 years I fished the vedder. Once my fishing skills improved and I was getting consistant coho results, I found whites unworthy at that time. I think they turn fast, loose flesh quality quickly , and are just way to slimy and stincky.
Once a fisherman figures out how to catch enuff coho to keep his family fed, he will be pretty hard pressed to kill a white spring unless he is hard up for bait!
Even in the smoker, the fillets can be so thick that the salt never penetrates and they get smoked on the outside but rot on the inside...we had several batches that smelled skunky and were soft next tor the skin...uuuuuugh