The PS4 version of Ultra Street Fighter IV is 1080p native resolution and has all the content already.
The XBox One version gets the 360 version with the add-on which is backwards compatible but the game itself is 720p native resolution.
If you are an active GamePass subscriber on XBox One, Super Street Fighter 4 is already free there.
PS4 version of Ultra Street Fighter IV :
XBox 360 version of Ultra Street Fighter IV running on XBox One X via backwards compatibility:
The XBox One version gets the 360 version with the add-on which is backwards compatible but the game itself is 720p native resolution.
If you are an active GamePass subscriber on XBox One, Super Street Fighter 4 is already free there.
PS4 version of Ultra Street Fighter IV :
XBox 360 version of Ultra Street Fighter IV running on XBox One X via backwards compatibility: