What I really think this discussion has come down to is the following. The better university for each person normally depends upon which city they prefer, as academically the universities are so close. The other important factor is the course - Oxford is better for some, Cambridge for others, though for many they are almost completely equal.
On top of all that, most people like whichever one they have gone to, simply because we do adjust to our surroundings, and build an affinity to the place where we live and study.
living in a city really isn't all it's cracked up to be