You are just trying to start a fight!!!
I will weigh in anyway. I have used both brands, but NLS is the main staple for my african cichlids. NLS gives me great results - and I am not just talking about looks. I am talking about general health, activity, breeding, etc. I am in no way saying that Omega One is not as quality, just that NLS works for my fish.
Now, in looking at the ingredients list, I believe NLS wins by far (comparing just the Omega One Super Color Sinking Cichlid Pellet and the NLS Cichlid Formula). While it sounds good that Omega One uses whole fish (like "whole salmon, halibut, whole shrimp") these are not actually the largest sources of protein. The reason is the amount of water in these ingredients inflates where these protein sources fall in the ingredients list. This is unfortunately a common practice in most pet foods.
Basically, ingredients are listed by amount, with the greatest amount of the first ingredient being used and the least amount of the last ingredient used (I hope that made sense). Since both of these fish foods are pellets, almost all of the water is removed. An ingredient like whole fish has a large amount of water, which is lost during the manufacturing process. This water loss is not translated to the ingredients list, so these whole fish products really fall much farther down the list and are likely not even the main source of protein. On the other hand, most of the water is already removed from the fish meal, so it is likely that this actually is the number one ingredient.
My main gripe with NLS is I wish they listed the components of the fish meal. What part of the fish is used and what type of fish. But the fact that Krill meal comes first means that is the main source of protein, so in part I am satisfied.
I will finish by saying again, I am in no way saying Omega One is a bad food, or that it is not as good as NLS. I am simply stating facts about ingredients lists, manufacturing processes, and my own personal experiences.