My experiences are that VG carries flavor almost just as good as PG, but it will take a little extra time to steep. If you’re vaping liquids that are best after a short steep and fade off with age, you may want to increase the PG a bit more.
That said, I’m talking between MAX VG and 70/30. If you go 60/40, 50/50, 40/60, the difference will be minimal to non-existent. As some have said above, it depends from mix to mix a bit as well.
I think it’s more important to get the ratio right based on the throat hit you want and what the requirements are from your equipment (with regards to wicking and leaking). Just remember you need to steep a little longer than recommended if you increase the VG ratio.
I’ve also experimented with distilled/de-ionised water as a PG replacement. This is something PG sensitive people use to carry flavor and thin the liquid, but I think it adds too much harshness when you vape it.