ups vs united states postal service is a comparison of two major shipping carriers in the U.S., each with its strengths and offerings. UPS is known for its robust network of international and domestic services, especially for larger packages, business shipments, and expedited deliveries. USPS, on the other hand, is more cost-effective for small packages and offers more flexible services for residential deliveries. For e-commerce businesses, understanding the differences between UPS and USPS can help optimize shipping strategies and reduce overall shipping costs.