You will find proponents on here for every feed manufactured under the sun. I personally like the Purina Aquamax products mostly because they are the easiest High Protein feed for me to get. The feed store in my town can order whatever Purina product I want and have it here in a week with no shipping charges. The Aquamax MVP has multiple sized pellets which makes it a good feed for fish of different sizes.

I am sure you will get many more opinions soon. There are also a lot of existing threads on this subject if you want to dig around for them.

NTHA - North Texas Half Acre
Cattle Ranch Ponds