Hello seeking advice as US citizen who lived in London for past 4years

Hello everyone,

My name is Mo. I am a US citizen and a recent graduate from university in London. I will be receiving an undergraduate uk and us degree. I want to ultimately work in London. I have 1 job offer from an investment bank with an interesting scheme. A 3 month paid 30K per rota internship, then discussion of a full time job and  employment at the end of the second month. In the US, i have a full time employment offer in same field with a competing company. I am contemplating what to do. I want to stay in London, but the scheme is risky, if they do not offer me a job and I have to return back to the states and start over again in terms of job search. What salary would you suggest is best for an american to live comfortably in London at my age and in my situation? What is your advice on staying in London now with this opp vs coming back post work in the US? Difficulty level vs options available? Also in which field is easiest?

Really appreciate any feedback!!

If you want to ultimately work in London and you have a job offer in London. The answer is obvious.

Basically if I you are hired while your Tier 4 is still valid, you will be exe,pt from the resident labor market test.  If you leave, it'll be near impossible to come back to the UK.

Salary depends on what type of lifestyle you require.

Thank you for your response!!