Oh, I didn't know about the Teflon coating. From what I just read virtually all razor blades - both double-edged and cartridge - have PTFE coating. (Where PTFE is a PFAS compound, and PFAS is the family of compounds also known as Teflon.) But there is some hope for an alternative someday. https://www.pcimag.com/articles/111660-a-close-shave
So I guess I would say stick with double-edged. Or maybe electric would be better specifically with respect to water pollution? Since that's the big issue with PFAS. I don't know, just a guess.