1. Faculty: The Mass Center has many top chemistry competition coaches, most of whom come from well-known universities in China and have rich teaching experience and competition experience. In contrast, Beidou's coaching team is relatively small and its quality is not as good as that of the center of mass.

2. Teaching resources: Centroid has a perfect teaching system and rich teaching resources, including high-quality textbooks, problem sets and test papers. In contrast, Beidou's teaching resources are slightly insufficient and not as rich as the center of mass.