PG - lets through the most harshness and TH of nicotine and the most flavor
VG - softens the TH/harshness and dulls the flavor a bit and adds more visible vapor
Also, different brands all taste different. Chinese juice is usually the same Dekang stuff but the US mixers blend their own.
I like 70pg/30vg, sometimes 80pg/20vg for more TH, 50/50 for some dessert flavors
If you like the PG version but it is too harsh, you could buy 30ml of the PG version and 10ml of the VG version and mix them (would make 75pg/25vg)