Your supervisor and the program should be your main criteria, not the country. Many of my friends have had miserable PhDs if they had the wrong supervisor for t

Your supervisor and the program should be your main criteria, not the country. Many of my friends have had miserable PhDs if they had the wrong supervisor for them. My 2 cents of experience based on Oxford, for what it's worth. It's a beautiful city and the University still opens doors 10 years later, when I think it shouldn't matter. The network is also a powerful one, which you can leverage in your career, if you make the effort. During exchange programs, I noticed students at Oxford and Cambridge generally cover more material than their American counterparts, as the undergraduate degrees are more specialised. The CS departments at both also emphasised mathematical content over software engineering - I'm not sure where you want your focus to lie