NLS all the way. Sorry guys.
Whole Antarctic krill meal, whole herring meal, whole wheat flour, algae meal, garlic, soybean isolate, beta carotene, spirulina, vegetable and fruit extract (spinach, red and green cabbage, pea, broccoli, zucchini, tomato, red bell pepper, kiwi, apricot, pear, mango, apple, papaya, peach), vitamin a acetate, DL alphatocophero (E), d-activated animal sterol (D3), vitamin B12 supplement, thiamine, riboflavin supplement, pyridoxine hydro-chloride, calcium pantothenate, L-ascorby-2-polyphosphate (stable C), choline chloride, copper proteinate, ethylenediamine dihydroiodide, cobalt sulfate, ferrous sulfate, manganese sulfate.
Whole Salmon, Halibut, Shrimp, Wheat Flour, Wheat Gluten, Fresh Kelp, Astaxanthin, Lecithin, L-Ascorbyl-2-Phosphate (Source of Vitamin C), Natural and Artificial Colors, Vitamin A Acetate, Vitamin D3 Supplement, Vitamin E Supplement, Vitamin B12 Supplement, Riboflavin, Niacin, Pantothenic Acid, Folic Acid, Biotin, Inositol, Tocopherol (Preservative), Ethoxyquin (Preservative).
As you can see, both brands have whole fish first. But... NLS uses garlic, spirulina, and other fruits and veggies (in small amounts), which really help to bring out color. Garlic acts as an amazing parasite preventor. Omega one uses wheat qluten, NLS uses whole wheat flour.