I definitely try to choose store brand, at least initially. Sometimes, I can tell the difference. For example, I tried my store's brand of filters for my Brita: I could tell the difference immediately, so I switched back. That happens sometimes. Recently, I tried my store's brand of peanut butter. I'm partial to smooth Jiffy but the store's organic smooth brand was less than $2.00, around $1.18, unbelievably and was just as good if not better.
Yep, I always at least try store brand paper products, frozen foods, canned foods, etc. I tell you who has good canned vegetables: Aldi's! As with all canned goods, I rinse off the water and then use a jig of lemon juice to brighten up the flavor and of course a bit of stock and more spice if I want, and they really taste fresh like that...at least to me and anyone who eats with me (they could be humoring me😊).