Because 'how the question is interpreted' makes comparing subjective happiness survey results hard to compare, one other way to approach the question of 'are hunter-gatherer societies happier' is to look at the people who move between hunter-gatherer and modern societies and study their happiness and outcomes. On the one hand, lots of hunter-gatherer peoples who switched into living in modern societies (e.g. Inuit in Greenland) have fairly bad outcomes ( to my limited knowledge, further study obviously needed here), on the other hand,  few seem to opt to return to the hunter-gatherer lifestyle, potentially suggesting modern lifestyles are preferable to hunter-gather lifestyles. 

Is there a significant cohort of people who've gone from living in modern societies and moved to live in hunter-gatherer societies? If yes, they'd be a useful group to survey. If not, is this evidence that modern lifestyles are preferable to hunter-gatherer ones, because no one 'votes with their feet' and moves from modern societies into hunter-gatherer ones?