When in doubt about ordering juice from a new vendor, I choose one of the following:
1. Go with the one the juice vendor recommends. Many mixologists will state which ratio they get the best results from or recommend the ratio most of their customers use.
2. You can't go wrong with a 50/50 pg/vg blend IMO. You can generally be assured you'll get plenty of flavor and vapor production.
On a side note, I once ordered two bottles of my favorite flavor from a vendor that I often order from. One was a 50/50 blend, the other was 100% vg. I vaped them side by side in identical cartomizers in identical pyrex cartotanks. I was not able to determine any difference in flavor or vapor production between the two. My conclusion from just this one experiment was that I, as an individual, am not able to tell the difference in different ratio's of e-liquid. Granted, your mileage may vary.