I'd recommend giving chemnic a try. I've invested in about 2 gallons at this point, and am happy to have found this nic.
I'll compare it to Nicselect, since theirs is pretty popular, sold by ECX and NR, and what I have the most experience with. Chemnic's has a much lighter "smell" to it. More importantly, it doesn't oxidize as quickly on the wick. With other nic, I've noticed that the first few hits are a little harsher after a device has been sitting unused for a couple hours (or over night). I get almost none of that from Chemnic's nic, which is why I switched over to them.
I haven't tried Vaporstek to compare, but haven't needed to try other brands once I bought Chemnic's nic.
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