PG - thin, lets
through the most of nicotine TH and irritation, lets
through flavor/aroma best, makes weak vapor
VG - thick, dulls TH and irritation, dulls flavors, makes thicker longer-lasting vapor
Most people like blends. I like 70pg/30vg. Some like 80pg/20vg, some like 50/50. A smaller number like high VG or all VG or all PG.