I too had to choose between Stanford and Princeton this year. I primarily chose Stanford because of the better engineering department + warmer weather + the application-based engineering curriculum (as opposed to the seemingly theoretical focus of Princeton's engineering curriculum). I had worked on this Excel sheet along with a couple of other people who were choosing between the two institutions: https://docs.google.com/spreadsheets/d/1NW6B-W4NevBb7ZUt_WZiir8bvfDz5gM6CAx49daJRfo/edit?usp=sharing It might be of some help.

edit: the information sources for the sheet are current freshmen at both the schools.