Who would be the top nation.

Regardless of who might win the top slot:

https://www.nytimes.com/interactive/2017/09/18/upshot/best-health-care-system-country-bracket.html?hp&action=click&pgtype=Homepage&clickSource=story-heading&module=first-column-region&region=top-news&WT.nav=top-news

the US will not win it even though of all the health care systems in the world it is:

THE MOST EXPENSIVE.