I think the OP is requesting whether to purchase nic that is PG nic, or VG nic? in order to satisfy his end batch of home brew, to be mixed at 80/20. Seeing as he states PG nic first, transposing that to his final ratio statement leads me to believe the first number would be PG, though why anyone would want 80%PG 20% VG is beyond me
Getting back to the point, I would bow to Itsmeitis's vastly superior knowledge on all things mixology ! Personally, mine is PG based as that was what was being offered at the time. Either way, providing you use the relevant safety precautions, concentrations, and the right mixing calculator you should be fine IMO. I don't believe that one is superior to the other
