One natural gauge of what constitutes "superiority" is who is most capable of passing on their genes (and memes) into the future. Clearly while Europeans have had great success in the past, and an overwhelming amount of modern ideas, technology and art descend from Europeans, the number of Europeans is dwindling while the number of Africans is increasing, and the comparative influence of non-white culture is growing. By this metric, those with the highest birthrates are essentially "superior" making Sub-Saharan Africans the superior race.

Contra leftist cultural relativists, I think most races have a pretty similar idea of what constitutes a successful civilization. So that could be another definition of "superiority". If the West falls, as seems likely, it can hardly be said to be a successful civilization at that point. But that will have come amid racial replacement of the West. We have to ask, "would any other race have produced a civilization with as much success?" - and I think a reasonable answer is no, and another is that the Chinese could give it a good shot. I don't think there's a black superpower on the horizon but I could be wrong.