One more note in the Rayon vs Japanese Organic Cotton discussion at hand...
For JOC, one of the best deals is for a pretty large pkg of the MUJI brand you can find dirt cheap, on Amazon.
I personally like to use Rayon sometimes, JOC other times. Really depends on my mood more than anything else. (Or what's handiest atm without me needing to go to the other side of the house to replenish one or the other from where I keep my supplies).
Tastebuds can also play a part.... You ever eat or drink the exact same thing and have it taste different at different times somehow? Or maybe another analogy could be how it's good to change shampoo brands or formulas time to time, alternate them (regarding hair, I've never shampooed any vape stuff, not even a wick

)
Then there's boredom... and just wanting to shake things up a bit. Rayon to JOC... JOC to Rayon... Blending the two together. Whatever.
We can all read and research until the cows come flying home after sprouting wings, but
nothing is a substitute for trying something yourself. Because everyone is different. And when something is affordable enough to be able to try and test with, you owe it to yourself to do so