I like Omega One. I believe it to be a premium brand. I use the flake food as the staple diet, and freeze dried blood worms, and brine shrimp to supplement and as a treat because they seriously LOVE it, especially the brine shrimp. But yes, I believe flake food is the way to go generally speaking.
I may not know something others here know...but I think brine shrimp is perfectly nutritious...in the freeze dried cube form. I still use flake food because I know it is manufactured with just about everything the fish needs, meat, kelp, etc, and is LESS LIKELY to cause algae.
I rarely feed frozen foods , like the cube form (brine shrimp blood worms etc,) simply because THOSE don't have much nutritional value. They are mostly water and have very little protein, fat etc... you would need to feed much more often to be adequate.
All in all, flake would be the best option if you want a single food source. Other types of food will certainly cause algae, maybe you're over feeding? Or have other problems going on? But yeah if you think you're having algae problems with your flake food, then it'll be worse with other methods of feeding. Premium brands of anything are also less likely to pollute the water, generally and comparatively that is.
I also do FW tanks, but I believe feeding and stuff is relatively the same. I think most foods can go both ways but wanted to point out that I deal with FW. I also don't have years and years of experience like others, just adding my two cents.