I started to investigate the same things you are now around 1 year ago, i thought that Oxford were more set up for the sponsored student & i felt that the difference in money could not be justified.
Having visited both Cabair & Oxford both appear to be quite good schools (on face value) however as far as which one to chose for its reputation, i would still have to say Oxford, it does seem to be more well known.
I belive though this is more good marketing than training, as both schools seem to boast simalar pass rates.
At the end of the day it will (and always does) most probally come down to what you can afford rather than where you would like.
Sorry its not to the point but there are many different things to take into consideration when chosing you school, go & check them both out so you can make an informed decision.