“What I mean”...
First off, I don’t believe in any sort of genetic superiority,
but I do believe in cultural superiority.
“Western” cultures will invariably prove themselves superior in an environment of non-coercion.
I don’t see that any other environment would be a proper “proving ground”.
That said, I don't think that Western culture, at its best, is purely about material prosperity, nor is it defined by unfettered mutual voluntary cooperation. Western culture has always been fundamentally religious (pagan at first, Christian for 2000 years), and has always existed within a framework of laws. America, in the last 50 years, has denigrated the religious aspect of Western culture, elevated material prosperity above all else, and turned the rule of law into anarchic tyranny. So what we have now is still a Western culture, but one that is destroying itself even while it is materially prosperous. Our culture is wealthy, but unholy.