100% Natural Nourishing Mascara, Black Brown vs Stack Waterproof Mascara: which is safer?

Where these two actually differ

• We flag Fragrance allergens and undisclosed sensitizers and Bacterial growth and contamination in wax formula on the Burt's Bees and not on the MAC.
• We flag Formaldehyde-releasing preservatives, Heavy metals in pigments (iron oxides, mica, lakes), Fragrance allergens and sensitizers and Polymer film residue and lash damage on the MAC and not on the Burt's Bees.
• The Burt's Bees is Wax, pigments, natural oils (typical mascara base) where the MAC is Waterproof film/coating (unspecified polymer), which is most of the difference in these two grades.
• The gap is 45 points, wide enough that this is not a close call, and the Burt's Bees is the one to buy.
• We are less certain about the MAC grade, at 45% confidence against 78%, because it discloses less.