I don't feel any of these things provide people with more or better opportunities than those I have here, or elsewhere in many western-European or Asian countries.
The universities here are great, and actually rank equal to or better than all but a handful of US ones. The quality and availability of health care is basically the same, for a much lower price. Even for rare treatment options that are only available abroad (e.g. in the US), which are covered through regular health insurance. There are many high-tech companies in countries like the UK, Germany, Scaninavia, Netherlands, etc. Maybe not as many software companies as in Silicon Valley, but those only employ a tiny percentage of people. If you have a university or college degree you can make a great living here, and your standard of living is most definitely a lot better than in Silicon Valley. I know because I travel there regularly for work and have many direct colleagues who live and work there, some who transfered from here, and I know how much they make and what their cost of living is.
Having 'more of X', 'biggest of', 'best of', 'largest economy' have exactly zero meaning in the context of the lives of individual people. Just looking around what we have here, and what you have in the US, there are no 'pros of capitalism unchecked' that are exclusive to the US for the vast majority of people. There are many cons though.
There reason for my somewhat snarky original comment is that I honestly don't think anyone could come up with any factual, comprehensive facts that prove that the US has any exclusive benefits from 'capitalism unchecked'. In fact, most lists (per capita income, poverty, cost of living, education, vertical mobility, health care, and maybe most importantly: happiness) the US is not even near the top.