Men's Stretch Supima Cotton Non-Iron Dress Shirt vs Men's Farrier's Work Shirt: which is safer?

Where these two actually differ

• We flag Formaldehyde and formaldehyde-releasing resins (in non-iron finish), Azo dyes and heavy metals in pigments, Finish degradation and fiber shedding over time and Skin irritation from finish residues (contact dermatitis) on the Brooks Brothers and not on the Patagonia.
• We flag Formaldehyde releasers in durable-press resins and Chemical off-gassing or skin irritation from finish residues on the Patagonia and not on the Brooks Brothers.
• The Brooks Brothers is Supima cotton with non-iron finish (likely resin-based) where the Patagonia is Organic cotton, standard construction, which is most of the difference in these two grades.
• The gap is 70 points, wide enough that this is not a close call, and the Patagonia is the one to buy.