My impression is Cambridge is more silicon technology, Oxford is more carbon technology.
i.e. Cambridge computing, Oxford biotech.
At least that's the impression I get.
Yes, my two PHD friends are making a decent living, but never amounted to anything, yet little ol me, with his HNC built much of the early Internet.
But to be fair, the old adage is, "How do you become a millionaire", you start with a billion and buy a football club.
So my Dad's global public company might have given me an unfair advantage.
His Dad was a gunner in the royal navy at the turn of the last century and was very poor, so my Dad probably kick started me.