These three are not in the same category, so it is difficult for you to choose from them. If you want to say how to choose, it depends on what you like If it's just a simple fast food, I think a small milk pot and an enamel pot will do. It's very troublesome to keep the iron pot. Generally speaking, if you still want to stew some dessert, I suggest using a milk pot, and the amount will not be too much to control.