So, no answer to my question about the difference between my 1440 x 1700 pixels per eye wireless Cosmos Elite and the 1632 x 1632 pixel per eye (upgraded to 2448 x 2448) Vive Pro 2. I guess I have to wait for independant comparative tests...
maxstep: HackPerception already answered your question. HTC use almost no compression, contrary to Oculus, that's why the image is much better and there is no latency, but it's much heavier. With the resolution of the VP2, it reaches the limits of the existing wireless technology bandwidth, even at 90 Hz. Concerning the price, Oculus have a very different policy that enables selling their HMDs at the lowest price on the market, by far. For professional use, the price of the Quest is the double.