Clearly Xbox gonna holds 60fps pretty well, if not only slightly worse than PS5.
Xbox is king in porting backwards compatibility games, PS5 is no match for that. This is another port suffers from "free to upgrade from last gen to next gen" with minimal efforts from devs. Ps5 version is with some tweaks special effects with same resolution as ps4 pro, Xbox SX is pc version with some tweaks and optimized abit. That's all there's to it.
As you can see, there are other games such as this, suffers from this "free to upgrade" syndrome, namely " division 2, ghost recon, mortal shell, etc.."
lol you speak as if running a multi platform engine is super complicated or something.
just maybe SX has that extra bit of raw power to push for more higher settings...?