I'm definitely going with the 3rd world countries,even though they are kinda reluctant to invest in the bitcoin,they have been actively investing in cryptocurrencies in the last few years..
And considering the level/cost of living over there,one can make a living off a little investment from crypto/bitcoin as opposed to some developed countries...
But isn't it same high value above every currency too? Take for instance, people who work in countries where they are paid with dollar, they also enjoy good standard of the money. The money there have good value, so if it is bitcoin was also converted to any country's fiat, it will be high and the purchase strength will be high too.