Hi, first of all, congrats, both are perfect programs. You need to first think about in which country you want to work. Secondly, Columbia's program is perfect in terms of reputation and it is very well known in the industry. Oxford's program seems focusing on theory rather than application, so if you are already good at codding and have relevant work/internship experiences, I believe you can pick Oxford, otherwise Columbia is better. By the way, if you don't mind, when you received your offer for Oxford? Did you get interviewed? Thanks