This is a pretty open question of course, as there will be different answers for different groups of people, and different kinds of ways in which a country can be good/bad.
I live in Germany, and while it's a country with many, many flaws, I can't say that I hate the country because, frankly, there's not many places I'd rather live. But of course, I'm a middle-class suburban white girl, the systems here largely exist to benefit me. For other groups of people it might be different. If I had to move to another country right now, Finland would probably be my first pick. I'm interested in China for a number of reasons, but I doubt that living there would ultimately be better for me.
So yeah, it's kind of a purposely vague question, I'm curious on what you think.
Like, morally? Either Cuba or maybe the DPRK, but I don't know enough about it to really say.
For the most comfortable conditions? Probably Northern Europe. I live in Ireland, and supposedly its one of the wealthiest countries in the world, but there's massive problems with housing and the cost of living is very high. I'd like to see Iceland. Also, I want to live somewhere with real wilderness. Ireland mostly has fields in the countryside, I'd love to get lost in a massive forest in Canada or something