That depends greatly upon the manufacturer and the specific flavor.
Conventional wisdom has it that PG is the flavor carrier and VG is the vapor maker. However, I have not found that to be true in every case.
I once ordered my favorite flavor in a 50/50 PG/VG mix, and also in a 100% VG mix to compare. Both tasted exactly the same TO ME, with the one with 100% VG producing more vapor than the 50/50 mix.
One thing to consider is what
juice delivery attachment you are using. Some of the earlier model clearomizers were not able to adequately wick thicker
eliquids (higher VG) and therefore were more likely to cause dry hits if you were a heavy vaper. Today's more current clearomizers have larger and better designed coil heads/wicks, so its not so much of an issue.