Cast iron pots are better. Because the human body needs a lot of trace elements, including iron. However, the human body gets very little iron from ordinary food, and a lot of iron absorbed by the human body comes from iron pots. The vegetables fried in iron pan contain iron, which is easy for human body to absorb. But when cooking, we can only use cast iron pots to mix iron, and refined iron pots can't make people get the iron they need. Refined iron is an iron pot made of molten iron and pressed into plates. Cast iron, on the other hand, is made of iron bumps, which are melted into molten iron at high temperature before making a pot and pressed by a mold, which is characterized by its large thickness. The temperature of the raw iron pot is high, the melt burns fully and the impurities are few. The disadvantage of raw wok is brittleness, and the disadvantage of fine wok is that it is easy to transfer heat quickly and paste the pot.