To take a contrarian view, the plastics wins handily in the reduce scenario. The plastic required to make a bottle is somewhere around 1/25 of the material required compared to glass. It's high tensile strength and fracture toughness means a huge reduction in material processed per container.

The flip side to that is convenience - the ability carry and dispose of a 1/2 ounce plastic container, vs a pound of glass container - makes it ideal for conditions where you are less likely to recycle.