Regardless of what any study says, if you keep "all" your fish, "all" your fish will die. If you release all your fish, "some" of your fish will die. Common sense. I don't need a "study" to tell me that. I also have nothing against fishermen that keep some fish for food, if they like that. And I'm certainly not suggesting that either case is "better" than the other.
Personally for me, no freshwater fish can hold a candle to just about any saltwater species, when it comes to flavor. Which is the main reason I practice CPR.