[user104658]

I obviously have no idea in terms of teaching standards etc. having not been to either, but the international credibility that comes along with being Oxford alumni, either undergrad or postgrad, automatically makes an Oxford education extremely valuable. Cambridge has a great reputation in academic circles too, obviously, but outside of that the "Oxford" brand is pretty much unparalleled to this day save for a few of the most high-profile US schools (Harvard et al).