MSc management Boston university vs Georgetown vs kings college London

I got into the MSc management programs at BU, GU, and KCl. I received scholarships so the difference in cost is negligible.

What I am most concerned about is networking, connections, and reputations. I am American and I would like to try stay in the UK after school for some time, but my understanding is that it is very difficult to get sponsorship in the UK should I want to stay there. I know KCL has a good reputation in the UK but I am unsure about their corporate connections, reputation, and alumni network in the US. Ultimately, I would prefer to live in London but I am concerned that it may be the wrong choice if I end up in the US. Any thoughts?

Which CU… what University?

What do you mean which CU?