None really...I guess if I had to pick something it'd be high on life (likely a timed exclusive, and was also on XOne, so not sure it counts) . For all those saying Psychonauts 2, it was a superb game, but was not an xbox game, it was Multiplatform indie game funded on kickstarter many years ago, where 3/4 of the way through dev MS bought the studio. I played it on Playstation. It was also on last gen.
I despise car games so that rules out Forza. I used to love halo in the old old days, despite the pre release warnings I had hopes for infinite, but it was one of the most forgettable gaming experiences for me in recent years. Played through the campaign in a weekend, and it was hollow and soulless tripe. I really hope Xbox step up their game.
That aside, the seriesX is just a gamespass machine, ive not bought or been inclined to buy a single game on it. If something im interested in is on gamespass, and its not been designed to take advantage of the dual sense in any decent way, I'll boot up the xbox. Otherwise it gathers dust, vs the PS5 which is on every day, and gets at least £1000 spent on it each year in software.
For PS5, id go with Returnal, demons souls a close second tho.