I guess both works.
BTW, in Oculus Connect 6 Oculus announced that Oculus Quest will be able to support PC VR games by using USB Type C cable (Oculus provides official cable "Oculus Link"), so that Quest will be very similar to a Rift when it is used as PCVR. This function is supposed to release on November. Quest itself is all-in-one VR and have WiFi support (2.4/5Ghz enabled, 60Ghz is disabled by Oculus somehow), so Quest may have more possibilities.
As other's have said, no need to reinstall software, a have CV1 and Rift-S just plug in & play.
You need some light for the tracking but it's surprising how low the light level needs to be, depending on the size of the room, if you don't want excessive light coming through the nose gap, (assuming it's night) a 1W LED lamp is enough for what I would call an average size room. In my small study room, I turn off the light and monitor, and just have the light on in the hallway outside, and that's plenty enough.
I use my PC surround speakers for the best results in my small room for seated VR, but larger room-scale VR where you're walking about needs headphones for sure to avoid poor positional sound. You may prefer the headphones for seated too, I just find speakers and a subwoofer nicer and with a bit more directional information.
Whatever chemicals you use just make sure they don't go anywhere near the lenses, I've avoided chemicals completely.
Edit: I forgot to say... have fun!
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