I haven't followed too closely but IIRC the tracking hardware is the big difference between the two. Vive has passive beacons and the headset and controllers can locate themselves within the room based on the time of sweeps of IR laser beams. This is very fast and doesn't add CPU load.
Oculus does it with computer vision and (for room scale) 2-3 1080p 60Hz cameras. I've read reports of USB 3 bandwidth problems; you have to be careful about what gets hooked up where and some people went as far as adding a PCIe USB card to handle them.
EDIT: Oculus has published official notes on this, see link below. They recommend two sensors on your USB 3 ports and the third on USB 2 to get it on a different USB controller.
I'd read up on the other factors if I were you. I've also heard that Oculus is lighter weight and more comfortable, but that Facebook/Oculus have made some unpopular moves on platform openness and pushing for Oculus-exclusive titles.
Overall I have a more positive impression of Vive, but I haven't used either company's retail hardware so I don't have a strong opinion on them.
That is because many people hate Facebook, and there for love anything that is not from them. Some people have similar feelings toward Value, who is not the bully on the block. But the anti-FB contingent is louder.
I have some sympathy for the "don't support exclusives" argument. It's up there with taking money from Dell to release games that will only run on Dell displays.
If there were significant differences between the platforms' capabilities I'd be more sympathetic, but they're basically interchangeable.
It's more comfortable out of the box, and they have a $100 band that makes it even better. However the PSVR uses a completely different style that is much better.
