I guess this depends on your definition of "greatest" is. Best value for money? Best service? Cheapest? Fairest? This is politics, there isn't really any hard

I guess this depends on your definition of "greatest" is. Best value for money? Best service? Cheapest? Fairest? This is politics, there isn't really any hard truths, just ideals. A highly valued European healthcare plan simply might not match with the ideals of the majority of American's. So "greatest" is always going to be relative to the society it's being implemented in.