I dont think there is any best or worst. There are 3 kings, aka triple crown, AACSB, EQUIS, AMBA
read more, https://en.wikipedia.org/wiki/Triple_accreditation
Accreditation is a process by which educational institutions are evaluated by an independent agency to ensure that they meet certain standards of quality. There are several different accrediting bodies for business schools, each with its own criteria and standards. Some of the most well-known accrediting bodies for business schools include the Association to Advance Collegiate Schools of Business (AACSB), the European Quality Improvement System (EQUIS), and the Association of MBAs (AMBA). Each accrediting body has its own unique criteria and standards, so it’s difficult to say which one is “the best.” It’s important to research the accreditations held by the schools you are considering and understand the differences between them. Additionally, accreditation is just one factor to consider when choosing a business school. It’s also important to look at other factors such as the school’s reputation, faculty, curriculum, and career support services.