These threads are increasingly tedious and the credibility of most statements is severely ruined by them being made by people with no experience of actually applying to Oxford or Cambridge, save going there. That is not to say that there are no people, who have successfully applied, but these arguments are always going to be flawed simply because people's choice of University depends on much more than their UMS Marks or the precise ratio of applicants per place for some college. Factors like the towns themselves, the look of the place, the people you meet and even the weather on the day you visit the university may all play a crucial role in preferring one university to another. I'm sure the 3-hour paper at Oxford for maths, which looks nothing like the one on the internet, is almost as good a separator of talent as asking for UMS marks, if not better, together with 4 days of gruelsome interviewing.
Oxford vs Cambridge arguments are pointless, much like many others to do with ancient rivalries.