But there's one thing that intrigues me. I come from the dog world and currently in the dog world there is a debate whether it is more healthy for our dogs to be fed purely raw food or dog foods.
I'm pretty new to the fish world, . I come from the fitness industry, where you have all the protein shakes, bars, etc. They are called supplements for a reason.
From a nutritional perspective, it is always better to get your macros(protein, carbs, fats) from whole foods instead of processed. A natural source of vitamins and minerals that are easily absorbed and recognized by the body. This then helps with metabolism, immune response, performance, blah blah blah. However, supplements are great to "supplement" whatever you are not getting enough of in your diet. If your diet isn't balanced in the first place, the supplements won't do much of anything for you. they don't have the foundation of proper nutrition to maximize results. (if anyone ever wanted a fitness nutrition lecture lol).
Not sure how that translates into a fish nutrition, but....I believe pellets or flakes with live/frozen food is great. Pellets give fish all the nutrients they may not be getting elsewhere. Particularly fiber and greens. Still on the fence about feeders though....those things can be riddled with diseases.