You did not ask me BUT....
I have RSSTs and some of the AGA series as well as a Kracken(clone)
I have found that I like different wicking materials with different juices if that makes any sense.
My thinner juices with lighter flavors taste better on Silica or Ecowool. My heavier flavors taste better on stainless wicks, I am still trying to decide weather I like cable or mesh better. Less fiddly with cable but you have a greater degree of customization on the capillary action with mesh.
My theory here is you would not have got a rebuild-able unless you wanted to tinker with it

get some of everything and see what you like best. With a decent build there are no bad options here, just what you will like better. I did read somewhere about bubble stone and got some from the local pet supply store. It is a teeny bit more durable than ceramic and is kind of a mix of the flavor you will get from SS/Silica or Ecowool. I did try ceramics, I did like them. This is all very small stuff, I am 6'6" and have large hands so I kept snapping the wicks. YMMV of course, but it is fun to see what you like or what is going to work best for you. Hybrid SS/Ecowool wrapped wicks are nice as well. And of course nothing beats a cotton wicked dripper
I am still on the journey to find that "perfect vape" just when I get there I find a way to tweak it.