Platform+content
Sony has it in a bag, no contest. It has a unified highly successful platform not only for people to develop on and sell their games through but also for the VR to be sold and marketed alongside. I don't see many devs making meaningful content for Oculus but then ignoring Morphues, whereas Morpheus will most definitely have big exclusive experiences. I also don't see many people spending $200 on something they connect to their PC. The simplicity of console package is will also apply to the morpheus but then I guess that brings up a better point actually, Sony and the others won't be in direct competition the same way PC vs consoles aren't really direct competition.
Sony will be the mainstream option for the average geek/gamer, fringe consumer who wants to try out VR and the others will offer more of a niche experience. I don't think VR will be crazy big this gen but I see Morpheus doing similar numbers to kinect but over a longer span of time. Kinect lasted like 2 years, VR on PS4 will be here til the end of its life (I hope/think).







