I worry about posting this because things change and different people have different views but:
I have tried out various versions of Oculus and Vive and read reviews and looked into tech of both.
Up front I will say I bought a Vive. My choice was based on inclusion of hand controllers and tracking issues. The Vive comes with two lighthouse base stations that provide 360 position for both HMD and hand controllers, and possibly other tracked sensors.
The Oculus comes with none yet, and even when the touch controllers are released, the problems that may or may not be an issue with the camera vs sensor tracking system made me decide on the Vive.
Yes, the Vive is more bulky than the Oculus, but adjusting the head straps for me has made it a non issue. Also, Steam and HTC seem to have better track record of delivering hardware and software, at least up till now.
Like I said, don’t base your choice on what I say, I am just saying why I chose the Vive when I did, which was months ago. I would suggest you try both and decide yourself.
Edited to add: one question is, would I buy either now?