300 Thread Count Cotton Sateen Weave Printed Sheet Set vs 400-Thread-Count Organic Percale Sheet Set: which is safer?

Where these two actually differ

• We flag Azo dyes and heavy metal pigments in printed pattern, Formaldehyde resins in print binder or finishing and Dye migration or color bleeding during wash on the Bed Bath & Beyond and not on the Pottery Barn.
• We flag Azo dyes and colorant toxicity and Residual manufacturing odors and off-gassing on the Pottery Barn and not on the Bed Bath & Beyond.
• The Bed Bath & Beyond is 100% cotton (sateen weave, printed) where the Pottery Barn is 100% organic cotton percale weave, 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.