Hi there, my friend! A lot of folks want to know whether they should apply for schools in the US or the UK, so you're not alone. Of course, it depends on which country you want to stay in a while to work after graduation. But, if you have the plan to go back to China, the main thing to consider is your ideal career path and what you need to do to achieve your career goal.
You mentioned that after graduation, you want to work at an investment bank in China. So, besides your degrees, related internship experience would be absolutely crucial. When you pick schools, you reeeeeeally need to consider whether your school schedule will give you the chance to do internships, whether there are many financial firms in the city of the school, and whether this school has a long-standing and tight connection with the industry.
So, what's most important right now? Do the research. You can search the websites, contact the school career service offices directly, or ask for current students’ contacts to chat more. Hope this all helped!