Almost all paper goods, specifically Kirkland brand.
Canned veggies are all the same as well, so whatever’s cheapest
most dried herbs and spices
staples like flour, butter, sugar, oil, etc. they are basic and as long as you are getting the kind you need (like AP flour or dark brown sugar) there isn’t any room for differences that the average consumer could notice anyways
I bake a lot and I've also noticed that sugar can vary between brands, mostly with how it's ground. When I buy the generic, this time it might be finer and next time, it could be really coarse. I usually stick with Domino brand now.
I have heard that Canadian flour is better than American, so maybe that's why, but I've never noticed a difference in flour brands. I've been baking bread for years and did it as a full time job for two years.