Seaton Textured Cotton Light Filtering Curtain vs Poppy Blooms Curtain Set of 2: which is safer?

Where these two actually differ

• We flag Azo dyes (synthetic dye toxicity) and VOC off-gassing (formaldehyde, toluene, xylene from sizing or packaging adhesives) on the Pottery Barn and not on the West Elm.
• We flag Azo dyes and heavy-metal mordants in fabric dyes, Formaldehyde-releasing finish resins, Volatilization of residual dye solvents and manufacturing chemicals and Color bleeding or dye migration onto adjacent surfaces on the West Elm and not on the Pottery Barn.
• The Pottery Barn is 100% cotton, uncoated where the West Elm is polyester blend curtain fabric, dyed, which is most of the difference in these two grades.
• These two are level, close enough that price and fit should decide it rather than our grade.