So far, both system's libraries are quite underwhelming to me. Actually, I had a lot of fun playing Titanfall on my friend's XB1, but unfortunately, I'm just not big on online multiplayer games. And nothing on PS4 interests me so far.
However, I'd have to base this on what we know they have in store for the future and in that regard PS4 wins for me. Unless XB1 surprises me with a new really good Banjo and Blastcorps, I don't see anything on the console outshining Uncharted (and to a lesser extent, God of War) on Sony's system.