Update after two tanks of juice of 3ml (mainly PG) each:
Both stil going strong and even.
The gauze:
The gauze in which I use a sweeter juice is now brown (not burned), no color change on the liquid in the tank.
I made the coil first around a 3mm drill. The wickhole in the DID is 3mm. Then I rolled a piece of gauze and stuck it through the coil in the wickhole. Easiest way to set up. Can put a new gauze wick in without distroying the coil.
Wicking is still perfect after 6ml and no crud on the coil.
The Yarn:
I took mij DID apart and filled the wickhole (3mm) with 9 pieces of yarn #12 and 3 inch long from the bottom. The idea was if the wick becomes less, i can pull a new piece of wick through the coil.
Then I put a 1,5mm nail in the wickhole and wrapped the coil, removed the nail afterwards.
In this I use a less sweet juice and after 6ml of juice the wick is caramel colored. No crud and wicking is still awesome.
I think the outcome will be equal and highly depends on what juice you use as to longivity of use.
BTW. I tried Bobas Bounty also but the wicking on braided cotton yarn was no good, I braided a wick from the yarn to tight I think.
Have to try the Bobas on the yarn strings and the gauze.
Keep you posted on results!
After more than 30ml each and two weeks of use I received the Kir Fanis "Clear Windows" for mij DID's so I'm going to rebuild the wicks/coils. Both yarn and gauze still work 100%, no crud on the coils. Little preference for the yarn in terms of wicking but the difference could be tightness of the wicks.
I'm fully on to cotton now, no more SS or silica. I rebuild a Vision with 4 strands of #12 yarn (long wicks) working great with my Halo Torque 56 liquid.
I also got a new ViVi NoVa that I rebuild straight away (still with the pics of the silica pieces in mind) with also 4 strands of #12 yarn (long wicks) where I'm using my AVE Gorilla Juice (100%VG, thick juice) in. Works flawlessly.
All juices tast better with cotton, no more silica dryhits. You know when you are low on juice with a lesser flavor but not those awfull scratchy silica or SS dryhits.
So, conclusion for me: Cotton Rules!
I don't think that there's much difference; I think a slight difference in the composition, maybe a lower melting point (which makes no difference for our use).