There are other subtle taxation differences that could really matter by jurisdiction as well (ie. low property taxes in much of Canada) and of course low health

There are other subtle taxation differences that could really matter by jurisdiction as well (ie. low property taxes in much of Canada) and of course low healthcare costs (though this matters less for the highly paid tech worker). I mean for parents in Canada they could get $10/day daycare in some places as that's ramping up more and more. That could be a dramatic cost savings for a certain person. It would be interesting to see someone do a real comprehensive look between the countries that touches literally every possible cost. I don't think I've seen that. With my own back of the envelope math comparisons, the countries did tighten up.