[neuronsguy]

If you have the option then the country is not your primary concern. The quality of your PhD experience is 95% determined by the quality of your supervisor and lab-mates. So you should judge based on that irrespective of the country. How much attention can they give you, how successful have previous students been, etc?

[GlenTheMachine]

Absolutely right. Go tour your potential lab and take the grad students out for drinks, without any professors present. Get them to give you the real story: is the professor sane and emotionally stable? Is the work environment supportive? How do graduates from the lab do, do they get good jobs and academic appointments?