The Series X has become my nostalgia box.

Goldeneye, Gears, Oblivion, the Master Chief Collection, ME: LE, The Orange Box, AoE II, Quake, etc.

I love my PS5 for the great catalog of immersive third-person adventure narratives, but I find that Xbox just has a tad more variety when it comes to its selection and caters to my childhood favorites a bit more.