As far as brands are concerned, Supor and Midea are better. Of course, the better ones mentioned above are not cheap.
Generally speaking, the ball pot and iron pot household are enough. Now the heating technology is advanced, which is IH electromagnetic heating. Don't buy electric heating plates for heating.
I have worked in the above-mentioned brand companies for some time, so I have a certain understanding of rice cookers. If there are other principles, I can ask.