I think the first generation will fit into 2 categories, the console crowd which will obviously look at the PSVR, which launches in October so that gives a few months for Sony to demo/hype it up in time for the xmas season.
The second is the PC gaming crowd, most of which will have hardware capable of running the Vive or Rift. I think will favour the Vive, if your a PC gamer with the hardware capable of running it already then you will likely want the full experience. Which suffice to say is only possible on the Vive. Yes its more expensive than the Rift, but chances are once the Touch controllers arrive the price difference will be minimal if at all.
So it's get the full experience now and support a company that is actively promoting open source and hardware, or wait ~6 months to support Oculus with their closed system. I know Palmer Luckey kickstarted the VR rebirth but the likes of Valve and Sony were working on it for equally as long behind closed doors, Palmer just made that knowledge mainstream and in the public eye.
I wish for all to be a success but I do not like how Oculus have backtracked so many times, going for promoting open platforms to locking it down.