I use formula 1 & 2 flake to supplement my frozen foods. I got the spectrum super soft pellets for my fish and they refused to eat them. My goby however, absolutely devours them. I don't feed the spectrum on a regular basis, but it may be something to consider if you have a goby and want to be sure it's getting something to eat.
I'm sure most of the commercially prepared flake/pellet foods are rather equal, the biggest thing to remember is that most fish will do best with a varied diet including fresh, frozen, and flake/pellet foods. Any single food is going to have a tough time producing optimum health in your fish.