Switch will sell more than ps5 and Xbox Series X, but not Switch's successor. Nintendo had a success and then bomb pattern. GC bombed, Wii exploded, Wii U bombed, Switch exploded. Next one will be a bomb unless they can break their pattern (my hope).
Between Series X and Ps5, I actually think MS will win for once because of all the studios they've acquired. Unless Sony can balance things out by buying more studios, MS is going to have a larger output of AAA exclusives. If they are quality then they win hardware war. If not then they will lose. MS explodes in America, someone wins Europe (by a little) and still gets crushed in Asia.
Sony numbers will be consistent as always.