@snOOziie
xone vs ps4
xsx,xss vs ps5 vs pc
and if you disable crossplay, you are playing with your platform
xsx,xss vs xsx,xss
ps5 vs ps5
pc vs pc
But can't I buy the Xbox One version and play it on backwards compatibility with my series X and just play the older version that should work right?
@snOOziieIt should, yes.
However I would also recommend you consider the Gold or Ultimate Editions of the game, since they both include the "cross-gen bundle" that will grant you access to both the XBox One and XBox S/X versions of the game in one purchase.
