No question, Red Dead Redemption is a big game on either PS4 or Xbox One

Remember three weeks ago when the Sony PS4 Pro Red Dead Redemption II bundle shed some light on the game and especially on the install size (105 GB min)?  Well, we now know the Xbox install size along with the full details around the PS4 space.  On the Rockstar Support page, it lists that the Xbox One install for both disc and Digital versions is 107 GB, with no additional space needed for the install process.  For the PS4, the disc version is 99 GB, but digital, while still having a 99 GB final install size, requires an additional 50 GB of space for the installation process.  While you will likely get this space back as the temp files delete, that is still a full 150 GB of space needed on your PS4 if you go digital.  As far as the 8 GB difference in final install size, it is likely will have something to do with this being an Xbox One X Enhanced game title is my guess.  From the Rockstar Support page:

Red Dead Redemption 2: Installation Requirements
Created October 18, 2018

Question: How much space will I need on my platform to install Red Dead Redemption 2?

Answer: The amount of space required to install Red Dead Redemption 2 depends on the platform you are using, and the method of installation:

Disc Installation:

PS4 - 99 GB installation space
Xbox One - 107 GB installation space

Digital Installation:

PS4 - 99 GB installation space with an additional 50GB for the installation process
Xbox One - 107 GB installation space