I will say the PS5 will sell more units than the Xbox. I can see PS5 selling 125mil.
The Xbox, honestly I think with them choosing to put there exclusives on PC as well as the console will hurt console sales, I don't think that MS really cares so much as they are going after that sweet GP money. But I see XB S|X Selling around 55mil, They may get some people back but in the end I think the hype dies down after the 1st year. IF the after market is any indication something maybe happening now, there seems to be more hype around the PS5 and the Xbox is dying off.