US Mail vs UPS Ground is a comparison of two major shipping methods used for domestic deliveries in the United States. USPS (United States Postal Service) Mail is a government-operated service that offers affordable shipping options for letters, packages, and other mail. USPS is often cheaper for lighter, smaller shipments, but it may have longer delivery times compared to private carriers. On the other hand, UPS Ground is a commercial shipping service that offers reliable delivery, typically within 1 to 5 business days, depending on the distance. UPS Ground is better suited for heavier or larger shipments, and its pricing structure varies based on size, weight, and distance. Businesses often choose between US Mail and UPS Ground depending on the urgency, size, and cost of their shipments.