Men's Slim Fit Non-Iron Dress Shirt vs Men's Farrier's Work Shirt: which is safer?

Where these two actually differ

• We flag Formaldehyde resin finishes, Formaldehyde off-gassing, Synthetic fiber content (composition unknown) and Coating degradation and chemical leaching over time on the Banana Republic 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 Banana Republic.
• The Banana Republic is cotton-blend with non-iron finish (likely resin treatment) 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.
• We are less certain about the Banana Republic grade, at 35% confidence against 72%, because it discloses less.