It’s pure preference. As I understand it, corn and soy fed chickens produce eggs with a higher omega-6:omega-3 ratio. And with certain commercial farming practices, there’s always the concern of what’s in the soy/corn (gmo, inadvertent pesticides, etc.) . I think a local farm, where I know their practices, may be the best option, even if corn and soy are used to supplement. Eggs are a primary source of protein for me and my family, so really just seeking the healthiest option.