Thanks Steve for your comments, will do some more research. Also looked at Pico but may just hang in with the Q3 until something else comes out.
The pixel count difference is negligible.
Meta Quest 3 has a display resolution of 2,064 x 2,208 pixels per eye.
HP Reverb G2 has a display resolution of 2,160 x 2,160 pixels per eye.
Bear in mind though that the video in the Q3 has to be compressed to be sent over USB from the PC, then decompressed at the other end by the headset. This not only uses CPU cycles, but also reduces quality of the image. I briefly had a Q3 and found the compression artefacts for sim racing completely unacceptable, eg road textures were muddy, distance clarity was lost etc. USB simply does not have the necessary bandwidth to transmit HQ video effectively.
The video over DP in the G2 is a "visually lossless" technology that still reduces bandwidth by compressing the signal, but the compression is imperceptible to the human eye (but not mathematically lossless).
Honest opinion now that we have Oasis? You simply won't get a better VR experience in sim racing for the money than the Reverb G2. You'd need to spend ten times as much before significantly bettering it, and even then you'd be deep into diminishing returns. It's a no-brainer.
But don't hang around. People are offloading them very cheaply at the moment, thinking they are getting one over on the buyers and selling them a soon-to-be paperweight because of the imminent bricking by MS, but as soon as Oasis becomes general knowledge then prices will surely rise and rarity will increase as people decide to keep them.
How cheap can you get a G2 for? As Steve said, you don't need the controllers, a joypad will do for the initial setup.