I believe they're a better choice for nutritional reasons. I just don't believe the food supply is brimming with toxic chemicals.
I looked up the ingredients for Wonder Bread (Classic)
enriched wheat flour,
soybean and or canola,
calcium, propionate-mold inhibitor
fumaric acid -aciifier often used instead of malic or citric acid
calcium carbonate-calcium supplement
calcium sulphate -coagulant, also used in tofu
monocalcium phosphate -source of calcium and phosphorus
calcium pantothenate-pantothenic acid, part of the Vit. B complex
pridoxine hydrochloride-Vit B6
sorbic acid-prevents growth of yeast and mold.
May contain trace amounts of sesame seeds, milk products, egg products soy products.
I would rather not have moldy bread, other than that, I see no deadly chemicals.
Obviously, whole grain bread is a better choice nutritionally.
"To give anything less than your best is to sacrifice the Gift."