The PS5 will obviously outsell the XBS. I think the Xbox Series will reclaim NA and will gain little more market share everywhere else.
The PS4 was definitely successful, but part of that was Microsoft and Nintendo completely faltered at the start of the 8th generation. Both companies are in much better position and PC gaming has become way more popular than before.
So my prediction for PS5 is 80-90 mil, while XBS is 40-50 mil. So about a 67% market share for PS5 and 33% for XBS.