Well, this is a good question ! From my own experience I can tell that PG is more fluid , and is to be used if you want something like stealth
vaping, because it produced less vapour than VG fluids. The TH (throat hit, so called) is stronger at PG fluids than VG ones....
It is a matter of taste the kind of
juice you are using. Just figured out some ejuices taste better in PG (like CIGAR taste,if you like that one). I'll mix my ejuices in different composition, some on 50 % PG and 50 % VG, others on 80 % VG and 20 %PG
As far as I know ejuices are NOT entirely VG or PG, because , at least the flavours are in PG liquids, so , hard to make an 100& VG juice.
Being a matter of taste, seems hard to get an correct answer....Herd yesterday some peoples CAN be alergic to PG....so, they have to stay on VG only.
Maybe a good way is to try some ejuices, in very small (sample size) bottles, so you will get the right answer.
Basically there are some receipts on the juices, like : TRADITIONAL , ICE-BLADE,VELVET CLOUD.
Velvet Cloud is made by VG 80 % and WATER 20 %, ...but still some amount of PG due to the flavour.
I think a wise ideea should be one day to mix your own juices to meet all your reuirements
All the best,
Mario