What is the best betta food brands?

I have three bettas right now that will not eat betta pellets, they will only eat Tetra BettaMin Flakes. But tha'ts not my question. I am getting two more bettas from a store where I know they will eat pellets. (That's what the other bettas' problem is, the petstore where they were at only fed them flake food, so they got used to eating it and now they won't switch back.) So anyway, what is the best 2 or 3 brands (to give a little variety). Thank you.