The PS4 has Infamous Second Son, which was pretty fun to play. Resogun is a great downloadable game too. Lots of indies, but most of those are available on steam/ps3/vita too. There isn't really much on either the ps4 or xbox one that you can't play on earlier systems/pc/each other.

The Wii U definitely has the most exclusive goodness to play on it, but it's also been out for longer. I doubt it'll be too long before the PS4 and Xbox pass it up.