Originally Posted by Daniel Piers

HTC Vive. Oculus Rift and PlayStation VR are limited in movement as they have only front-camera for tracking. This means you can't turn around ;(

Samsung Gear VR doesn't have any additional stuff - that's why it feels good [in terms on VR freedom] though the hardware is weak thus the quality is low. So the only real one VR thing is - HTC Vive. Also it's integrated with Steam, - this Autumn Fallout 4 and Doom are coming.