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.

https://www.oculus.com/blog/oculus-roomscale-balancing-bandw...

The lighthouse tracking system is almost incomparably better than the optic sensors of the Oculus.

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.