the
coil cotton fluffs out better in the wick grooves in the coil chamber than the Japanese cotton does, so other reasons to consider it. Less chance of flooding.
The fibers in the coil cotton are aligned very well and not as compacted as the ones in the Japanese pads.
It sounds a bit like my reasoning for using my organic cotton ball wicks, though the alignment isn't terrific, it's a little better than just regular "sterile cotton balls". I'm not knocking the japanese cotton or the rayon, they both work very well, but the thin juice I use makes the expensive cotton wayyyyy overkill, and I developed a distaste for the taste of rayon.
Andria