Materials major should belong to engineering. There is no doubt about the strength of Tsinghua, but I don't know much about Peking University. In addition, I am an undergraduate student of the Chinese University of Science and Technology. The direction of condensed matter physics in the School of Chemistry and Materials Science and the School of Physics of HKUST is related to materials. As far as I know, HKUST has a high rate of going abroad in condensed matter physics, even exceeding 60%. The research on superconducting materials won the first prize of the National Natural Science Award this year.

It is meaningless to choose a university for the absolute ranking of a certain major. You know the general ranking of a major in a school. Which is the first and which is the second is of little significance, because the ranking itself is controversial. Choosing a school should also be based on the general ranking of majors and combined with your actual needs. Tending to big cities is naturally not suitable for coming to China University of Science and Technology, and so on. You need to know more.