VG generally has less throat hit and slightly less flavor, has an inherent sweetness to it, and produces a lot of vapor. PG generally has more throat hit and conveys more flavor, but less vapor. This isn't true for all juices, depending on vendor, but just a general expectation when selecting
juice.
Unless you have a reaction to high PG
juice, I wouldn't worry about sticking with one or the other. A 50/50 blend is always a good place to start when deciding on what mix you might prefer.