When sourcing dried cranberries, quality is primarily determined by moisture content (typically 13-18%), sugar-to-acid ratio, and physical integrity. High-quality berries should be plump, uniform in color (deep red), and free from excessive clumping. You should distinguish between Whole Dried Cranberries, which offer a premium mouthfeel, and Sliced/Slivered Cranberries, which are more cost-effective for baking. Ensure the supplier uses low-temperature drying technology to preserve the natural antioxidants and proanthocyanidins (PACs).