In reality different people have different priorities, so no single country ever can be "the best", as that solely depends on the individual priorities.
It's also not like RT and Xinhua are making up the stuff they use to agitate against the US, like most propaganda it's usually based on at least a kernel of truth.
For example the US incarceration rate is a pretty blatant outlier, particularly among developed countries, a factual reality that clashes very harshly with the self-propagandized idea of "Country of the free". The regular "race riots" in the US, and their scale, are a clear indicator to still unresolved issues on that end.
Disregarding these as "It's only Russian/Chinese propaganda!" is exactly the kind of mindset that leaves these issues unresolved and tolerated as "normal".
[0] https://foreignpolicy.com/2013/07/14/u-s-repeals-propaganda-...
[1] https://www.ohchr.org/EN/NewsEvents/Pages/DisplayNews.aspx?N...