So far my preference is for NN Signature. Here is my personal opinion on each:
NN Smooth - smooth, but was light amber on arrival, and darkened over a month or two to a dark amber. NN says this doesn['t affect flavor, but my taste buds said it did.
NN Signature - smooth, arrived with little color, darkens very slowly compared to the Smooth I purchased. Has a distinct chemical smell that I believe is benzoic acid (NN Smooth may have had that as well). This does affect taste on subtle flavors, like NET diy juice, but not in any way that makes me not want to use it. The affect on taste was not noticeable ti me for other flavors such as peppermint or custard.
LNW and NR - very similar to me, they don't have that smell of benzoic acid, but they do have a taste that's hard to describe, like a "smoked something". One of them (forget which) made me cough a bit every time I took a draw or two.
Note that I tried all three, LNW, NR, and NN Smooth with NO flavorings, just PG and VG mixed, at about 24 mg/ml nic concentration, so I could taste the nic salts itself.
I vape a very high PG/VG ratio, most vape high VG here, so impressions may be different with high VG. I have seen several other opinions giving preference to LNW and NR, and taste is with the beholder, so the final verdict is with you.
As far as TruNic salts goes, it may be the best thing since cotton candy, but I will never know, I looked all over the website and no way I will order off an "anonymous" website that doesn't provide a phone number, or email address, or a physical location, with the only way to contact them on the website being a form. Call me a skeptic, but I totally disbelieve that "if its on the internet, it must be true"
