I don't really consider Bethesda to be 1st party for MS if you think about it now. Maybe in 5 years it might mean something. For now, Sony Bloodborne already beats out current gen MS 1st party titles.
But the real answer to your question is Nintendo LOL....cuz when you can still farm the shit out of the original Mario Bros on Nintendo and put it on Switch in BR mode and people still plays it, ya know ya made it big time.
I think Xbox has a better replay value vs Sony's 1st party titles mostly because there's multiplayer and you can co-op with friends over and over again. The few Sony good multiplayer game I can think that has some replay value is TLOU, Uncharted 2, and maybe LittleBigPlanet 3 and even that is stretching it. I guess Dreams is cool for artistic purposes.
Give me Horizon 120Hz with HDR and I will be glued to my seat for a entire weekend it launches.