Your PC is better. Pretty much acceptable. So there is really not that much difference between the 40% in the Pro and X. Really? Ok.
How is the 4k player and the fan noise. Good?
Fan noise the X is very quiet other then installing games via the disk its hard to tell its on. I dont know how demanding Forza 7 is on it but the console makes literally no noise when I was playing that.
There may be a 40% power difference between the X and Pro but again in my short time of trying CoD WW2 and Assassins Creed Origins there are tiny differences in picture quality to me.
I was running the game at exactly the same time on both the X and the Pro side by side on the same Samsung 4k PC Monitor LU28E590DS/ZA and I had was hard pressed to find noticable differences.
My wife who isnt a hard core gamer (she plays games like roller coaster tycoon from time to time) kept saying she couldnt see any differences.
In fact it was much as I had figured you seriously have to pause the game and point to certain areas to see a difference in these 2 games at least.
I dont know how the Pro runs CoD and Assassins Creed as far as upscaling vs native 4k but on these monitors the differences are small.
Not running those games on the Xbox one S the difference is night and day.