Most. I only buy brand products if I have a specific reason, like they offer a variation I want and off-brands don’t. While these cases exist, I find it somewhat rare that a brand product is genuinely of higher quality than store brands. Most of the time they come from the same producer and have the minutest distinctions. After all it would be more expensive to thoroughly split your production lines in two for the same product but one of high and one of medium quality, so usually they just save that money and settle for cheaper looking packaging for the store brands. The idea that brand products are generally of higher quality is just advertising brainwash.