on whether to do an MSc from Oxbridge. I know will think that this is a cheaper alternative to an MBA. To me it boils down to what do you want to do afterwards.
in a list of fortune 500 companies, you got ask yourself how many are US and how many are European based. If you carry your MSc from Oxbridge to an American company, I won't pay that person any higher compared to an MBA from American School unless that person has demonstrated relevant experience. Do the MSc program if you are still a fresh graduate and you happen to be around UK. but frankly, if you going to spend the money, go to LBS. Some MSc program doesn't require a GMAT, so from an employers' perspective, the entry bar is lower than traditional MBA program, so it is still considered a notch down below MBA.

Can I ask why do an MSc in Oxbridge, where you very well do a MBA program?