What will mold first yeast or quick bread?

Mold is more likely to grow on quick bread before yeast bread because quick bread typically contains more moisture and often has added sugars, creating a more favorable environment for mold. Yeast bread, while also prone to mold, generally has a drier texture and a longer shelf life due to fermentation processes that produce acids, potentially inhibiting mold growth. However, both types of bread can mold if stored improperly or for too long.