If you're intending a PG-heavy final mix, I reckon PG nicotine will be best.
PG nicotine lasts longer than VG nic, and some feel steeps a little quicker than VG.
Most of the eliquid calculators out there will ask you whether your nic is PG or VG, so that the PG/VG in the nic is accounted for in the overall mix.
I use this one :-
http://e-liquid-recipes.com/create