UK or US masters to be a trader in London

Hello,
Do think it is better to do a uk (Oxbridge,LSE) or a us (Princeton,Stanford...) master in financial mathematics to be a trader in London? (given I am French)
On the one hand the us ones are maybe more prestigious but on the other hand
the uk ones are maybe better for England because many traders in London are
from Oxbrige.
What do you think?
Thanks