I think I can make an argument that can end this discussion once and for all.
What we consider "best" is a subjective term and means different things to different people. Most people have not traveled to another countries and therefore base their opinions of "best country" based on what knowledge they have acquired from second hand sources such as television, literature or social media. But such people might not be aware of the mundane aspects of such countries that only someone who has lived there long enough or who has lived there. A tourist's opinion therefore is not conclusive enough to conclude a country as best, mostly because of the limited number of tourist cities that they have visited will skew their opinion away from cities that are not considered tourist cities. Therefore, the opinion of "best country" is not wholly accurate for such persons. This is even more evident because of Paris Syndrome being a thing.
Also, everyone considers their own country to be best. This is a fallacy because if all countries are best, then no country is. Everyone who has been brought up with faux-patriotic ideals will never admit to another country being better than their own. Such people are more likely to overlook or hide what would be considered bad aspects of society in their country so as to only spread a positive image of their country, which may or may not skew the outlook of people outside of the country. An extreme example of this is can be seen in North Korea who try really hard to show the world that their infrastructure and society is a literal utopia. However, thanks to the stories told by defectors and leaked propaganda material, everyone knows how it really is. Delusion is always a lie, but reality is always true.
IMO, a best country is the one that has little to no corruption, low crime, above average infrastructure, cleanliness, universally affordable healthcare, affordable or free education, low cost of living etc. But in reality I don't think there is any country that meets all of these adequately because that country would be a real Shangri-La. Perhaps some countries come pretty close but not adequately enough to be termed "best".
In conclusion, what country you consider best is only best according to you for your own reasons.
