One thing to keep in mind here particularly if the actual hardware being used is super close per the rumors is that Richard from Digital Foundry mentioned during that EGX 2019 talk posted yesterday that paper TF specs alone definitely do not explain how the Xbox One X can get 4 times the pixel count of base PS4 (6 TF versus 1.84 TF) and 2 times the pixel count of PS4 Pro in many games (6 TF versus 4.2 TF). Heck, Cerny himself said that he thought 8TF was necessary for 4K and we got native 4K on Red Dead Redemption 2 on the X. So we truly don't know much at all about eventual real world game performance a year out considering that both companies may be doing things in their architecture with cache, latency, draw call efficiency (the ultimate foundation of any graphics pipeline) and so forth. That is why consoles are more interesting than "off the shelf" PC parts.
Note that I do not believe that there is some crazy magic that will suddenly enable one or the other to have a huge performance advantage if the hardware is truly so close, just that eventual relative performance to each other cannot be credibly assessed a year out for the reasons I cited and final driver tweaks and everything else that can come (you see updated Nividia and AMD drivers all the time right when new GPUs launch that improve performance).
