You won't be missing Xbone exclusives much... Xbox has what Halo? and what? Scalebound? oh wait they killed that off. They don't really have mind blowing exclusives like the PS4. or any exclusives for that matter. Maybe timed exclusives, but still just wait a bit and you'd get it on any other platform.
PS4 exclusives are a real loss tho... You'll never get Bloodborne or Persona 5 or Horizon Zero Dawn on PC. Also all those niche Japanese games that are only on the PS4.
PC has a bigger library, more indie games, a keyboard and mouse; if you love FPS's, moba's, mods, emulation, and steam...
not to mention you have a lot more options with a powerful PC that's not just gaming :D