People will generally say in terms of lifestyle it is what you make of it.
While that is true enough it's also partially correct, for instance there would be not much point living in the Sahara if your idea of a good time is snow skiing.
It all depends on what you value as important for your lifestyle and what would make you happy.
Income is another odd one, a country can be high up on the list of nations with best income but it's all relative and it depends what you are doing in the first place.
Any country you can earn an income in is a good place to start.