Okay I'll bite. Lol
I still think @ $300 the PiMax 4k is still a nicer bargain. Sure it doesn't come as a complete vr setup.
But i have said time & again vr should be modular & not stagnant.
PiMax only doesn't directly support VR games that require Room scale with motion controllers. But there are enough viable diy solutions.
But there are still new games like Star trek Bridge crew that do not require special gimics to play (a standard controller is fine)
I myself have Razer Hydra that does work fairly nice for motion controllers.
Greg @ Drvr4vr has made diy options much easier to use things like leap/kinect/psvr.
The Rift is still on a temporary sale & its a dry debate as you know. What it comes down to rift & vive will have its market for now as PiMax 4k has its own market that prefers what it offers.
I know my preference will remain with PiMax as i like the better quality image & active developers that are listening to their community.
I like a wide variety if games like Ethan Carter VR upgrade (I am sure you know the one) this game makes Vive/rift users sick. Where as us PiMax 4k users just enjoy playing the game without being sick. lol