I've got 2 Gear VR sets (S7 Edge on the older and S8+ on the latest), PSVR and Oculus Rift w/Touch (3 sensors). I think my favorite is the Gear VR, just because it's the easiest to use, it's wireless and content is good. My wife has one with her S8+ (came with the pre-order), and she uses it to watch movies when she uses the treadmill.
The PSVR is good, but much lower resolution, so while games like Farpoint are a lot of fun, there isn't a "killer game" that really defines the PSVR as a MUST HAVE. PSVR is sorely lacking content, and many games have a VR level or something VR tacked in. I've not tried Resident Evil 7 in VR yet, but I'm not a horror game fan.
I really love my Oculus Rift, but I mostly use it with racing games. Racing games in VR are about as close as we are going to get for "killer game" right now. I've got the Thrustmaster TMX wheel and pedals, and the 360 car view with the force feedback of the wheel really has you feeling like your in the car driving. Dirt Rally and Project Cars are just amazing in VR.
I don't have much room for room-scale games, and can only get an 8x7 area when I move things around. Room-scale just takes me out of the immersion as I keep feeling the cord from the headset. Once these things go wireless, I think that's when it will take off more. I hear there is something coming to make the Vive wireless. Once that hits, I'll get my next VR headset.