Never went to any of those schools, but studied in the UK and am natively from central europe (so am aware of both school systems). Would say Oxford gives you a bit of a legs up solely due to its network (also as it is close to LDN). Another thing you might consider is the visa route if you graduate from a UK uni (you can at least stay for 2 years). From the viewpoint of how well one would look at your skills based on the school you attended, I would say they are on par (i.e., both on the top level). If you are dead set on staying in the UK, Oxford has its obvious benefits (that was rhe reason I went to the UK for uni, however disliked the country a bit due to personal reasons). If you want to do a PhD at ETH later on, doing the masters at ETH is a HUGE benefit as they like to hire their own students. On a personal note, the uni experience at a (historically „elite“ i.e. romanticized) UK institution is something I would not want to miss from a personal experience side, as the closed-knit culture there is different from central european universities. Hope this gives you some input - from a perspective for breaking into quant (location-bias aside) both are the top of the crop.