4 main metrics to look at imo: Ethnicity (white of whatever variety), language (something civilized (english)), culture (NO WELFARE), and taxation on bitcoin.
Looking into it myself, but at the end of the day the only way to know for sure if a given country works is to go there and live for a while.
As a US citizen, my only real options to reduce Bitcoin tax burden would be to ditch my citizenship or move to Puerto Rico. However, as jbreher mentioned, now would be the time to move to PR, while we're in the depths of a bear market.
I'd like to move out of the US, at least temporarily, just for the experience. But I have a baby now, which complicated things further.