I’m starting uni this summer with no financial help from family and *****y loans but still decided to live at the accommodation, live a little.
No point in worrying that much about money at our young age.
Personally I don’t think you should base it on money, pick the uni which seems best fitting for you and the one which has the best course.
Also as for networking and jobs after graduation I don’t exactly think the uni being in London helps, I mean for example Cambridge I’m pretty sure would have better connections than majority of London based universities. There are plenty websites which show employability after graduation for each uni.
For sandwich years you honestly can never go wrong with them they’re just really good, any experience is good experience. However make sure the actual sandwich year is in the field that you want.
For example my top picks when applying was Surrey, aru and rhul but compared to the rest Surrey, for psychology had so many options for the placement for all the different fields within psychology.
Do some research in literally everything and compare them both, highly suggest not to base it all on money unless you are certain even with loans and a part time job you won’t be able to afford the accommodation