Xbox one game vs sieres x games

If the game is only for the Series S/X then it will not work on a One.

My points, Xbox One x, Membership, XBOX LIVE GOLD 12, GAME: MARVEL VS Capcom. Marvel Vs Capcom 3 , FREE XBOX 360 . rewards

I'm not sure about that, as far I remember. All consoles that has the same version (Such as default original xbox game) thats backwards compatible on all consoles, will indeed allow OG vs 360 vs One (S AllDig X)

Series x consoles are NOT xbox ones

They ate just xbox series x or s

It's to avoid confusion xbox one games are compatible with xbox one all versions except for disk games on digital and can use hdds

Vs series consoles all digital series content work on series consoles

But disk games work only on disk consoles and next gen storage

As far as looks and the games it can play both consoles are the same. The X is slightly smaller. It's whats inside them that make the real difference. Xbox One X is a higher performance console. It's faster and supports a true 4K gaming experience. Here's
a decent article on the differences
HERE.