PG gives more TH and more flavor, but doesnt produce alot of vapor.
VG produces a lot of vapor, but dulls TH and flavor some.
I agree with hairball and recommend trying around 80/20, 70/30. 30%VG or less is alot easier to fill cartos with and doesnt clog them as quickly. All PG gives awesome flavor but produces very little vapor and nicotine is a skin irrritant so adding some VG gives some nice vapor and also dulls the bite of the nicotine. All VG produces plumes of vapor, but theres very little TH and the flavor can be alot duller. You just have to fnd the ratio that gives you what your looking for.
I normally make my juices at 80/20, 75/25, or 70/30. 80/20 is a popular ratio and it gives great TH and flavor, but still produces a nice amount of vapor. Many vendors have an 80/20 ratio and I would def give it a try