usps priority vs first class are two common shipping options offered by the United States Postal Service (USPS). Priority Mail provides faster delivery, typically within 1 to 3 business days, and includes features such as tracking and insurance. First-Class Mail, on the other hand, is more affordable but takes longer to arrive, usually 3 to 5 business days. For businesses shipping products to customers, choosing between Priority and First-Class Mail depends on the importance of delivery speed and the budget for shipping.