I'm surprised to see the UK as low as it is. But if there is one thing we do well, it's higher education.
The best US schools are the world best, yes. But there's also a lot of worthless institutions out there (think University of Phoenix).
That said, the problem with American higher education isn't the academic quality...rather it's access.
It's like the healthcare system. Of course American healthcare is the best in the world if you can pay cash for the best doctors. Same thing is basically true for higher education as well (yes, yes, many receive scholarships, etc.), to the point that students graduate with extreme amounts of debt that may never be paid off.
And at least at undergraduate and maybe even graduate level....I don't think the investment is worth it in America. If I ever go to PhD level or higher....then it would be worth considering.
What field are you in Franzl? It may be a very very bad idea to get a Phd in America depending on what you study.