I'd heard Hikari had switched ingredients and was not as good a quality as it used to be. When I was using it for my goldfish I was fairly unimpressed. Lots of cereal by-products and fillers.
New Life Spectrum foods are probably one of the best on the market. Omega One is also good, but their foods have a very high fat content compared to other brands.
Looking at the list of ingredients for Aqueon, there looks to be a lot of fillers in there (this is just the first few ingredients). Didn't know bettas needed corn in their diet.
Whole Fish Meal (Whole salmon, herring & other mixed fishes), Whole Wheat Flour, Soybean Meal, Shrimp Meal, Whole Dried Krill, Wheat Germ, Corn Gluten Meal,