>>322738171
remarkably amd gpus (5700 and 6000 series) are currently the better option for VR with SAM because of the way unity handles memory heap allocation, and WMR has the least CPU heavy reprojection and compositing. 
Everything is designed around index or vive or rift, however, so your milage may vary. 
One of the best headsets if you can find it right now, believe it or not, is a Samsung ody plus, but the cable is fragile.