Why would our cats prefer the junky cat food over the high quality one?

I don’t get it.. my roommate buys a bit cheaper of cat food than I do and the cats seem to greatly prefer it over mine. Hers is a type of Purina, more meat than the average “chow”, but probably with corn as the first ingredient, if I remember correctly. I’m careful to select high meat/protein foods, so currently, they’re eating Purina One kitten food, which has meat or meat products as the first two ingredients. (as an aside, I change it up so they don’t get fat off the kitten food)

Everything I know about cats would leave me to believe that my cat food would be going first, yet they just love that cheaper Purina and all the fillers. What gives?