Ok so
using this as a reference:
And from my POV of only owning a PSVR2 (and pre-ordering this) and not having completely comprehensive VR knowledge these are my bullet points for you:
-Quest store and PCVR support. Not the biggest plus, but it does offer some cross-buy titles with PC VR, and is a good selection of apps and software.
-Own THE standard. Meta headsets are what VR games are designed around and built/tested the most in. You're going to get the most compatible product on the market for software. Games are made to run at their best on this headset, well within what's feasible. It can't exactly run PSVR2 hybrid stuff, but the neat VR stuff like Red Matter 2 or Walkabout Mini Golf which is arguably a better use of the device, no doubt.
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Standalone. Big deal here if you've only owned devices requiring other hardware IMO. Ability to just tap a button on the headset and be right in the game with no extra fuss. Traveling or whatever (probably more by car than plane), take the headset and all the games loaded in it or just bring your library of 3D movies or whatever.
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Pancake lenses. A generation above the others in edge to edge clarity. Way way way better IQ.
-Better quality passthrough.
-Significantly higher resolution so way way way less pixels visible - can actually display UHD in full when each eye is sent a unique image. Alyx should be much nicer without the low resolution from what I've read.
-Better FOV than the Index (one of its weaknesses)
-Lighter than the index
-No additional setup of cameras
-Hand tracking
-USB C (modern charging and output capability)
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Wifi 6 (Wireless!) Complete freedom!
-Actually has bluetooth, but apparently not low latency AptX or whatever, so probably still going to use a dongle if going wireless earbuds
-Onboard storage, Android OS, etc
-AV1 codec decoding support @ 120fps (significant step forward in wireless quality and great for decoding newer format movies - AV1 is more future/popular than h/x 265)
-All this and costs less than the Index (I think)
-BigScreen/Skybox (in comparison to PSVR I think, Index had this, but now it'll be able to be higher res)