I don't know why so many assume the next xbox will be more powerful than the next playstation, if they both launch in 2020 they'll basically be the same thing. No matter how much money a company has they'll still face the same technical limits as any competitor, every high end cell phone right now has basically the same internals for that very reason. They'll likely try to differentiate themselves in different ways outside of "power" they've already laid that groundwork with game pass and they'll probably have some type of AR peripheral thing eventually. Sony will probably focus on enhanced VR as well as some other type of services
If they come out in the same year and are priced the same then they’ll be around the same power. The only way there could be a difference in power would be a different price 399-499 or a company takes a loss on hardware.
If MS are releasing two different SKU’s, they could possibly go for a higher price (499)for the high spec Xbox that the hardcore gamers would go for knowing they’ve got the casual crowd covered with the cheaper SKU.