I still think that, ignoring any possible health issues associated with silica, the flavor with silica wick was better than either cotton and rayon. Of course, that's really hard to "measure" accurately without identical mods and attys and juices...if then.
Just FYI--there is absolutely no risk whatsoever associated with using silica rope--the safe silica.
This is my old post on the subject. TMI?
There are two kinds of silica--amorphous and crystalline. The amorphous silica, used initially in cigalikes, is perfectly safe and OK to be used as a wick. The dangerous kind is the crystalline silica--the kind that causes silicosis.
The discussion about safe and unsafe silica started after Aspire introduced a mystery "ceramic paper" wick (ca 2014) that crumbled to dust when touched (Busardo showed it in his video). There was a suspicion that those tiny, respirable fiberglass particles (under 5µ) could get into our lungs. This chart made by @Boden shows the size of amorphous silica fiber used in silica rope (22-32µ)--the safe kind--in comparison to the unsafe, crystalline silica fibers.
http://srs.unm.edu/industrial-hygiene/media/docs/silica.pdf (sorry, the link doesn't work anymore, I'm copying and pasting from my old posts

"Amorphous Silica: Multiple studies have found amorphous silica to be biologically inert when ingested and inhaled, with the exception of extruded fiberglass and ceramic fibers (which have been designated as carcinogens by the National Toxicology Program), which are hazardous due to their very small size and their high length to width aspect ratio. Because of this inertness, the US Food and Drug Administration permits the use of amorphous silica (not fiberglass or ceramic fibers!) in food and medicine. "
Warning: My Aspire Atlantis coil just FELL APART while I was vaping, and particles got lodged in my throat.