Difference in content available on Vive vs. Oculus?

Both the Oculus and the Vive have their own hardware benefits, with the biggest difference being room-scale motion tracking.

My big question in determining which HMD to purchase is the difference in content availability. Other than the homemade Oculus games or HTC games, will there be a difference in what games / experiences will be available on both units? Can and will developers port their games to both platforms?