The two base liquids
PG - thin, lets through the most flavor and the most of nicotine's TH and irritation, makes thin visible vapor
VG - thick, dulls/smooths everything PG lets through, makes thicker more persistent vapor
Well, there is the Chinese juice, usually Dekang, usually 100% PG - some of the tobacco ones are OK. Since they are 100% PG there is full TH for the level of nicotine but 100% PG with medium or high nicotine can be irritating to the mouth, throat, sinuses or even lungs
Most US juice makers offer at least one PG/VG blend and many offer every possible 10% blend (actually juice makers, not hardware stores selling prepackaged juice)
Different ways to vape sometimes work best with certain thicknesses of juice. No list is complete but this thread is good
Atomizer and cartridge (or drip tip which can be used if you have a manual battery) - any PG/VG as long as it flow well enough to keep the atty wet
Stuffing-type cartomizers - I find 20% or less VG juices keep a carto working well the longest (though they are still disposable and few can clean and revive them). I can get 1 week or more good use out of a carto (since I usually alternate between a pair, that is 2+ weeks for the pair)
Tanks and Reservoir cartos - I think these like 20-30% VG juices but it depends on the vendors - some vendors may thin their thicker juices when they make them so some with higher VG will work. And some higher VG juices may work well if you thin them a bit with distilled water.
There are lots of good juice vendor but you will like some juices and not like others.
I use stuffing type cartomizers and get thinner juices from FreedomSmokeUSA, Gourmet Vapor, a couple of Vapor4Life WOW juices I like, Voidmist, Juicy Vapors, Vaporbomb, Tasty Vapor, Purevapes, Velvet Vapors and more. Plus just a couple of Dekang Chinese juices from Madvapes and LiteCigUSA.net.
Link to one list of vendors that sell small samples - the check the end of the thread for later list
http://www.e-cigarette-forum.com/fo...se-list-juice-vendors-have-3-mil-samples.html