If we just talk about oil, I'm sure the size and quality are the same! But the price of small bottles will be higher than that of large bottles because of the high manufacturing cost.

Large bottles are eaten for a long time after opening, and will be oxidized when exposed to air for a long time, so some people say that small bottles are fragrant.

As for daily-use products, I dare not say whether the quality is the same because of different industries. Personally, I think it should be the same