I like the fact that saving a clip on the X1 doesn't rip me out of the game and into the Share UI. This isn't so much a problem on the PS4 during single player games but during multiplayer it's a pain in the dog and sometimes the UI takes too dang long to load if there is a lot going on.
As far as exclusives, Titanfall would probably be my favorite so far but I have it on PC. The X1's upcoming lineup really doesn't appeal to me. I don't know enough about Scalebound to be excited about it but it does have my curiosity. Considering that I'm a Halo fan, Halo 5 definitely has my attention.
I don't know for sure but you can change the PS4 setthings to record and save without need to open the screen... just pressing the Share button.