usps ground advantage vs parcel select compares two USPS services for shipping packages. USPS Ground Advantage is designed for slower, more cost-effective delivery of heavier items, typically taking 2-8 business days within the U.S. Parcel Select, on the other hand, is a service aimed at high-volume shippers and is often used for larger shipments. It typically has longer transit times but offers competitive rates for bulk shipping. The choice between these services depends on cost, weight, and delivery time needs.