I've also heard it stores better in VG for long-term storage. The thicker consistency of the VG keeps the molecules from moving around and interacting with each other, limiting the amount of oxidation that can occur over time. At least that's how I understand it, according to our resident chemist
@Kurt. And with 100mg nic, it doesn't matter much for mixing ratios, since it's only going to be a few percent of your total mix. I've used both, and while PG is a lot easier to work with when using syringes, I've since switched to dropper bottles and a nice .01g digital scale, so that's no longer really an issue for me and I plan to make all my future nic purchases in VG base.