That's a very good goal. You clearly need a better managers and better companies to work for. The research experience of the PhD might help, but it's not the solution to all problems.

For a more pragmatic point of view, look at where your future professor's students are. In a 250+ ranked school, the school name is not going to land you a great job by default. You'll need to be working with a good professor. Your summary of the publications of who you are working with doesn't seem stellar, but without details on where he publishes I can't say much. How many students does he have?

Do you have only that one offer or more?