Definitely glass for several reasons:
#1) Plastic tends to degrade the substance it contains; especially during the steeping period
#2) I don't like the idea of vaping plastic residues that leach out
#3) Droppers are much easier to use to fill cartos
#4) Amber glass protects against UV damage
#5) Glass is reusable
#6) Glass just looks better sitting in my cabinets or on my counters
#1) Plastic tends to degrade the substance it contains; especially during the steeping period
#2) I don't like the idea of vaping plastic residues that leach out
#3) Droppers are much easier to use to fill cartos
#4) Amber glass protects against UV damage
#5) Glass is reusable
#6) Glass just looks better sitting in my cabinets or on my counters