I think reputation is the most important factor when it comes to choosing a university.
First, the reputation of the university can affect my career. To be specific, most employers consider the applicant's university when they recruit new employees. People who are from prestigious universities are expected to do well at work by many employers. Therefore I will have a higher chance of getting employed.
Second, I can study with more competitive students in the university with good reputation. To be specific, high reputation attracts many skillful students from all parts of the country nationwide. So I can interact with brilliant students If I attend well-known universities.
For these reasons, I think that reputation is the most significant factor when selecting a university.