uuuuuh, PS5 has more backwards compatible games (4000+) Vs at most Xbox's 3197, and while Microsoft is investing MORE in GamePass, you can't pretend Sony doesn't also have something similar with PSNow (and with the PS+ Collection being a part of PS+). They're not the same, as we've established, but they're similar enough that you can't really pretend Sony isn't trying or that Microsoft is pulling way ahead or something.
I haven't done the math and it's very possible Sony still has more games that Xbox ready for PS5 bc just based on PS4, alone. I think he may me talking about legacy--playing some of the Xbox, Xbox 360, and Xbox One games you already own on your Xbox SX (or, *snicker* Xbox SS).
Either way, we're gonna have more games than we could ever hope to play on day one no matter which console/subscription we prefer.