VR headsets right now break down into inside out tracking and outside-in(lighthouses)
If index is the benchmark, then vive cosmos with light houses would be next best? not too certain
then there's Windows MR but microsoft has semi-abandoned that, no new hardware other than HP Reverb G2, which was co-developed by Valve. However still same limitations as windows MR(moving the controllers out of view of the camera's does funky stuff as well as occlusion, sticking the controllers behind each other so that one controller blocks view of the other.)
then there's facebook/oculus with pc link, but then there's that whole TOS with facebook and the privacy and Terms of Use rules that will brick a Quest 2.
Also security researchers may have jail broken Quest 2 so complicated and maybe shady instructions needed to free quest 2 from facebook.
www.androidcentral.com/quest-2-has-allegedly-been-jailbroken-bypassing-facebook-login-requirement
not published yet due to possible legal action from facebook/updates to quest 2 units to patch the exploit.