priority vs ground advantage outlines two different USPS shipping options. Priority Mail is faster, usually delivering in 1–3 days, and includes flat-rate packaging, insurance, and tracking. Ground Advantage is a more economical service with slightly longer delivery times of 2–5 days, replacing the former Retail Ground and First-Class services. It also includes tracking and basic insurance. Businesses choose between the two based on urgency, budget, and item type. While Priority Mail is ideal for time-sensitive deliveries, Ground Advantage offers significant savings for non-urgent packages.