"It's when the poorest leave, often by very dangerous avenues of escape, that is the most telling. They are the ones that supposedly are best served by these regimes, who have the most to gain by staying. They are not leaving for riches and fame, all they want is a fighting chance."

I think it's when they start to eat grass and bark, it's the most telling.
It's obvious that Cuba isn't as bad as N Korea.
I don't know which country has had more poor people leave it- that mostly depend on China border security vs who wants make an ocean trip in boat-like thing.
One thing though is the lack of poor people wanting to get into either of these countries. Rich people visiting is another matter, and rich people visiting and praising these countries shows mental retardation or perversity.