All groceries. It might be a surprise to some, but generic brands are usually very good in this area. My approach is to always buy the generic first, and if it's not good enough then try a name-brand.
For foodstuffs I wouldn’t even notice if something was not good or a brand would be better. Unless the brand is cheaper, I’m pretty much always getting the generic. It’s still ridiculously expensive.
Generic canned corn has worse color and flavor and more husk pieces than green giant fresh select. Basically the same as regular Green Giant though. If they made a premium generic canned corn I'd be all over it.