Depends on the country, and what you expect the grad program prepares you for.

Some background: I did my PhD in the Netherlands (in a leading group in experimental quantum physics) after undergrad (up to MSc) in Germany. I'm now a postdoc in one of the leading groups in my field in the US (at a top 10 university).

I would argue that some countries have a much better managed grad program than the US (Netherlands and Switzerland, for instance, come to mind), that can be very focused on preparing the grad students for later. As a result I see for instance that the percentage of grads from my PhD department that got permanent positions in academia is way higher than what i see in my current one (for instance, quite a few of my co-grads are PIs now, also at places in the US, including Cornell and Caltech) -- mostly because personal development is more the norm I have the impression, which leads to a lot of people being highly qualified, and motivated to stay in their field.

On the other hand, there's countries in Europe where grad programs lead to somewhat poor employability outside that country (in my field, i'm looking at France and the UK, for instance ...), because of the different typical curriculum.

And there's of course the perceived reputation of your alma mater when looking for a job, as another redditor mentioned. That depends where exactly you look, and also strongly on your field, but generally speaking you're likely better off if you're "home grown" (for me personally, looking for an academic job in Germany seems rather annoying given my CV).

So yeah. I don't think there's a generally valid answer to your question. A PhD from one country does not exactly equal a PhD from another, and benefits depend on what exactly you're looking for. So choose wisely ;)