What about western Europe?
They don't really rely on skilled immigration to a significant extent. And for what they do, they have states in EU itself to cover it (Poland, Romania etc).
The US is the most populous developed country therefore in absolute terms will always have more jobs and more immigrants.
Even if you look at per capita numbers, US does beat Canada, which I would argue to be the most skilled immigration-friendly country.
However the quality of life is really debatable. Many people would prefer the quality of life of Europe, Canada, Japan, Australia. Personally I think oil rich Norway seems to offer the best quality of life.
The mistake that is often made when estimating said quality is looking at the averaged stats. Thing is, if you're immigrating for the sake of a good job, you need to look at what that job (and others like it) will give you, as opposed to the average or the median. In US, the average is indeed lower than most other western countries because of the wealth gap and piss-poor welfare policies. But people coming here for high-paid jobs (like IT) are getting a deal that's much better than average. And with enough money, you can absolutely have a great experience in US - a good house safe low-crime neighborhood, a great school for your kids in the same neighborhood, solid healthcare, and a private pension fund for retirement. And plenty of jobs to pick from.