The G2 has the advantage of display port connection to your pc so no image compression, but I don't notice compression on the Q3 (some people do though). The Quest 3 has better lenses which produce a better display i.e. clarity across more of the view and greater fov. The G2 has better audio but the Quest 3's audio is pretty good. The G2 is quite old tech wise now, the Q3 is new. At some point you might want to play non-sim games and if so the Q3 is the better option for this. Meta's software is imo better than the G2's software. I'd go for the Quest 3. Edit: i've owned both.
The link cable is for linking your pc to your quest 3 so that you can play "pcvr" games (vr games running on your pc) in your quest 3, so things like assetto corsa on steam, you are basically streaming the games from your pc to your quest 3 via the link cable. You don't need 1, you can play wirelessly if you have a 1GB ethernet cable from your pc to your router and your router can do 5GHz or better wifi (your quest will be on this band and should be the only device on it). Cable has it's advantages/disadvantages. If you do buy u don't really need the expensive Meta link cable, i use an Anker 5m cable from Amazon iirc cost £15. But any old USB cable won't do, needs to be long enough and minimum USB 3.0. Amazon also has a Q3 silicon facial cover for £10 that fits fine, I bought 1 the other day.
I don't know if you've only tried the G2 v1, but on my v2 my tracking is near perfect. I can T-pose or have my hands straight up 12 o'clock and have it track my wrist movements perfectly. For sim racing the G2 visuals are fantastic. Much better than any wireless headset I owned (Quest Pro and Pico4)
Where from, good Sir?
For the price, it's amazing - especially compared to pricing of other HMDs currently.
Didn't you have to return yours?
Yeah, I think I had one with a giant black spot but the others were all dead pixels
