Xbox One exclusives:
Forza
Dead Rising 4 (1 year exclusivity)
Halo
Quantum Break
Recore
Crackdown 3 (Seems like they're building hype for it - comes out in 2017 or later)
Personally, Xbox One's exclusive games are ****, especially when compared to the PS4's exclusives. I know timed exclusives are getting popular and that's where it seems that Xbox wins because PS4 is getting DLC first and some indie games first, but Xbox One has had games like Tomb Raider that just recently got released to PS4 after all this time.
I plan on getting a PS4 this Christmas basically for the exclusive games. I don't think I'm even going to buy a PSN pass. PS4 has a completely different style with most of their exclusives. They're darker games, more mysterious, and all around more interesting. If you want, I can list some of the PS4 games I want to get when I get mine.
PS4 exclusives:
Infamous 2nd Son
The Last of Us
The Order: 1887
Until Dawn (oh boy am I hyped for this)
Ratchet and Clank (I actually don't want it, but it's got good reviews)
Uncharted (The Collection/4)
Bloodborne