Not just for standard of living, but in terms of just about every single field possible...by all measurements. Economy, stability, politics, laws, industry, quality of life, health, education, leisure, peace, safety, crime rate...the list goes on and on.
Obviously there isn't a country that excels the most in every single field, but what single country do you think provides the best compensation all round for all the possible fields? You can name ONLY one.
srsly, google it, you may not have heard of such a place...
Airstrip 1 Orwell was right nuff said
The United Boroughs of London.