usps priority vs express mail are two different shipping options provided by the United States Postal Service (USPS) for sending mail and packages. USPS Priority Mail is a reliable, cost-effective service that offers delivery within 1-3 business days, depending on the destination. It includes free tracking and delivery updates, and some packages are eligible for flat-rate pricing, making it ideal for businesses and personal use. On the other hand, USPS Express Mail, now called Priority Mail Express, is the fastest option, providing next-day delivery or 2-day delivery for certain locations. Express Mail includes overnight delivery, a money-back guarantee if the package is not delivered on time, and additional features like insurance and signature confirmation. While Priority Mail is less expensive than Express Mail, the latter is better for time-sensitive shipments.