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

Where these two actually differ

• We flag Formaldehyde resins in textile finishing, Azo dyes and heavy metal colorants and Dye migration or bleeding onto skin or other fabrics 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 textile, no stated coating 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.