The PG. I have been readying your posts and can follow along but want to make sure when it's time to filter that I do that properly - never used filter paper but I am going to check that out.
E-Cigarette Forum
If I remember right the vanilla beans remained in the PG for many months (I forgot about them!). The extract had an earthy sweet taste that I augmented with DIY flavor shack's "Holy Vanilla". The results reminded me of Nicoticket's vanilla flavor.
The PG extraction was the best. I filtered it down to 2 microns using filter paper.