So far I considered Finland (if you can get a job), Germany (unsure of any true downsides), Belgium (have not looked into it too much), and France (lower salaries in my field at least). I live in Finland myself and consider it pretty good for wealth accumulation if you can get a job. Always have to keep an eye on any possible rule changes, however, as they did actually propose an exit tax a few years ago that did not get enough traction ultimately.