I think it's better to go to a university, because the knowledge gained by the university is more comprehensive and standardized. In the long run, the platform for working and developing in a university is wider and the competition is greater, but I can really improve myself continuously.
A firm with more than 7 people may be considered a big one in Chengdu, but it may not be in Beijing or Shenzhen, depending on the business scope of the firm.