There's really no "better." In terms of safety, both are quite safe, and in things you use on and in your body every day. Apart from the occasional person with a PG allergy (which I have never heard of being extreme, and is somewhat rare), I have heard of no adverse reactions.
PG gives more flavor, a stronger
throat hit, and less vapor.
VG gives more vapor, a gentler
throat hit, and less flavor.
Personally, I prefer more PG. I love the vapor of VG, but I love a strong flavor and solid throat hit more. PG is also thinner, and I notice that liquids with lots of VG tend to gunk up my cartos slightly faster than PG liquids.
Everyone will have different preferences. Just get a few samplers and see what you like.