Used to be NLS and Omega One (shrimp pellets, color pellets, veggie pellets, their other products weren't as good imo), this was after some extensive, long term testing years ago, combined with educating myself about ingredients, which, by the way, all led me to stop using Hikari-- cheaper ingredients, a fussy Burundi frontosa I had at the time wouldn't eat it, and some beautiful wild C. mloto I'd bought were becoming dull looking on it. These two things started me on the whole food thing In the first place-- after which the mloto returned to their former beauty. All this was before I joined any forums.
Omega One's ingredient list changed to cheaper ingredients (don't know, maybe a year ago), so I stopped using it. I also tried Northfin bug bites at one point for some wild angelfish that took over a month to start eating anything, I also tried feeding them to my other fish. Eh, I wasn't impressed, judging by their effect on color on the rest of my fish-- my angelfish wouldn't eat them, the first thing they started eating eventually was freeze dried blood worms. I didn't get the bug bites again once I used them up; I can't speak to other NF products.