https://pubs.usgs.gov/periodicals/mcs2021/mcs2021-iron-steel...
PET is at 30%
https://www.epa.gov/facts-and-figures-about-materials-waste-...
Is your particular bottle going to be part of the 20%? IDK... but it's more likely by definition that the PET one is going to be part of the 70%, and is also more damaging in every possible way.
Except when dropping it on your foot.