usps express vs priority mail is a common comparison for people looking to choose the best shipping option for their needs. USPS Express is the fastest service, guaranteeing overnight delivery to most U.S. locations, including on weekends. On the other hand, USPS Priority Mail offers a 1-3 day delivery window but is more affordable than Express Mail. Both services come with tracking and insurance, but Express Mail includes more extensive coverage for delays and lost items. The choice between these services typically comes down to how quickly you need your items delivered and how much you’re willing to spend on shipping.