As far as speed of delivery is concerned, USPS Priority is generally seen as superior, being able to deliver typically in two to three business days as opposed to up to two weeks with UPS® Ground.
Is UPS ground or USPS Priority quicker?
Although UPS and USPS offer overnight delivery, USPS Priority Mail Service has an average delivery time of just 1.7 days, whereas UPS Ground has an average of 2.75 days. Therefore, USPS is the better choice if your package is time-sensitive.
How fast is UPS Ground priority?
Fast: One to Five Business Days\n\n UPS Ground® gives you cost-effective, reliable ground delivery within one to five business days.