I probably couldn't somehow rank the top ten countries, it's so dependent on variables and opinions and what seems relevant to me, coupled with my ignorance about many of these places. I might get there and discover the place is really a dump because you can't get an electrician to show up, or it takes months to get a DL, etc.
In France, it takes months, literally, to sell a house, there are so many steps involved. Our friend had a signed contract on her place in February and still has not closed. She had a verbal agreement in October.
We would find that sort of thing frustrating.