Hi
@Ghostfreak0786,
Although I can't advise you on these specific universities, I can offer some help on the side of choosing which uni to go to. Where you mentioned that the only thing stopping you from LSE is it's "supposedly inadequate social life and bad campus experience", are these things that are important to you when choosing a university? If so, you do need to consider these things, as when choosing a university you need to consider what is most important to you, be that the course, modules, societies, sports, local area, etc. as you will likely be at your university for at least 3 years, and if you don't enjoy life outside of your course, it may be something you later regret.
Where you say that a pure maths degree might disadvantage you compared to a financial maths and stats degree, with most universities doing a pure mathematics degree there will usually be compulsory modules, but also the ones that are optional and you choose - here is where you can tailor your course to what you personally want to study, and in your case, this will probably be Financial and Stats based or recommended prerequisite modules. I would suggest taking a look at what modules each of the universities you are considering offers, and also what each module entails (two modules at different universities may have the same name and cover subtly different content, and also different universities have different assessment methods). If you are looking to be an Investment banker and love maths, you could always do a pure maths degree, tailoring your degree to the financial and stats modules, and consider a year in industry/summer internship relevant to investment banking, as when potential employers consider applicants, experience is just as valuable as a degree.
Even this isn't relevant to any of your specifically named universities, I hope this helps you choose the right university for you.
Isabel
(Mathematics student and University of Southampton Official Rep)