IzzyJG99
By nature the black garbage bags and liners are thicker. To make the clear ones clear they're usually thinner, so yeah black is better.
I can't seem to get that line out of my head - "By nature the black bags and liners are thicker" - it's made me chuckle since I read it. I'm picturing the black bags in their natural habitats, suddenly trapped by man, and put into service as trash bags.
At least where I come from, you can buy varying thicknesses of black or clear bags - with the thickest being labelled something like contractor bags these days.