Washed European Linen Core 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 colorants and Fiber shedding or microfiber release on the Brooklinen 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 Brooklinen.
• The Brooklinen is 100% European linen, washed finish 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.