TL/DR - check the courses, have a shufty, flip a coin.
Each of Oxford and Cambridge is small, easy, and safe to walk and cycle around in. Hardly any student drives around either city. Students walk (at night they may stagger, because reasons), ride a bike, or take a bus.
Everywhere in Oxford and Cambridge is close to everywhere else. Even so-called distant colleges such as St Hugh's at Oxford and Girton at Cambridge are not really far from anywhere. If a person is not mobility-impaired and the idea of walking twenty minutes from a college to a Faculty, lab, or library bothers that person, then he or she would have, I suggest, issues in life larger than "which of Oxford and Cambridge"?
Disabled access varies across the universities. Some of the older buildings cannot easily be adapted for wheelchair access. Quads (Oxford) and Courts (Cambridge) are not always wheelchair-friendly, and the traditional arrangement of college living and academic spaces in a series of staircases is problematic for those who cannot use stairs easily or at all. But every college has at least one modern building, ranging from sometimes dodgy 1970s ones at or near the end of their shelf-lives to very recent ones which are state of the art in mobility access.
The two cities are set up for pedestrians and cyclists, not for motorists, which is as it should be. Oxford is the car town of the two (Morris, then BL, now BMW Mini), but both cities have ring roads/bypasses, park and ride car parks, and so on. Oxford has a C Zone and a (small) LEZ zone. I don't know about Cambridge in that regard. Driving should, I suggest, not even be on (or high on) your list of considerations when choosing between these two (and some other) university towns. Parents can drop off and pick up their beloved wains at the beginning and end of terms - it's no big deal.
When you say "Asian", do you mean South Asian or East Asian? Oxford has a bigger South Asian population than Cambridge, mainly located in East Oxford, where there are South Asian shops. The student populations of both universities are ethnically, socially, and religiously diverse. The non-university population of Cambridge is, I think less diverse than that of Oxford, because Cambridge does not have an equivalent of East Oxford.
Because of Cowley and Blackbird Leys, Oxford is more working class than Cambridge, but both are very middle class cities. You see flag-shagging in parts of Oxford, but not (as far as I know) in Cambridge (although Cambridge is an enclave of civilisation surrounded by deep Farage-country). Oxford feels psychologically closer to London than Cambridge does, although each is geographically close to the Capital and well connected to it by trains and coaches (the 24/7 Oxford tube coach service included). Oxford has easy access to and from Heathrow by coach. Cambridge is closer to Stansted.
Note that Oxford and Cambridge are the only places in the UK to which you go UP when travelling from London.
The student lifestyle at each of Oxford and Cambridge is similar. The two old collegiate universities have far more in common than their differences of official terminology, academic slang, and customs and traditions might suggest. Strictly speaking, Oxford has traditions, and Cambridge just has habits. I am joking. It is fashionable for Oxonians to pretend to deplore Cambridge, but in reality we don't. Cambridge is our daughter university and we love her, in the way that we might love a naughty and foolish daughter.
Oxford is, as well as being a university town, an industrial city with a huge car factory. Cambridge is mainly a university town with associated science and tech industries. Each city has one of the very best NHS teaching hospitals anywhere in the UK.
Visit both. Decide on look and feel and on course contents.
Architecture? Oh yes, each city has some of that. Oxford has nothing to rival the Cambridge Backs. Cambridge has nothing to rival Radcliffe Square. Oxford has nothing to rival King's College Chapel. Cambridge has nothing to rival the Schools Quadrangle of the Bodleian Library, or indeed the Radcliffe Camera itself. Ashmolean Museum (Oxford) vs Fitzwilliam Museum (Cambridge)? It's a draw.
WARNING!!! Cambridge punts from THE WRONG END OF THE PUNT. Naughty and foolish daughter, you see?