As of January 2020, the PS5 was more powerful than the XBox Series X. (Verified insider)

https://mobile.twitter.com/wccftechdotcom/status/1223404988048658432?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1223404988048658432&ref_url=https%3A%2F%2Fs9e.github.io%2Fiframe%2F2%2Ftwitter.min.html%231223404988048658432

Basically, a verified poster on Resetera who is a game developer, said the PS5 is more powerful than the Series X as of January 2020. However, he did say that dev kits aren't final so that could still change.

Fun times...