I think the commenter you responded to filtered first for countries with outcomes better or exceeding the US? Though I’m not sure Portugal and Spain automatically fall into that category
I can only n=1, but most, if not all, experiences we've had obtaining medical care were better in Europe. Care specialist for my autistic kids, primary care, etc. From my unofficial surveys, many folks I know in the US are having a hard time finding various care providers, even if they have insurance. More data on this is always welcome.
Oh, I picked Singapore, because I moved here. I picked US because that was the topic under discussion. And Britain because the parent comment talked about 'free' healthcare.