My business mails 100’s of packages daily. 2/3rd USPS, the rest mostly FedEx. The packages sent USPS are delivered much faster than packages sent FedEx (or UPS). Even parcels sent to far away zones USPS get delivered in an average of 2.5 days. Items sent to far away zones FedEx or UPS take 5 days (for FedEx) and 6 days (for UPS). The packages delivered in 2-3 days USPS are sent either 1st class Parcel or Priority Mail (never the slow Parcel Post) and cost less to send than the slower FedEx or UPS.
I had just the opposite experience. I once worked in Amazon's customer service and occasionally had to deal with undelivered orders. Invariably the problem was USPS. In addition if we contacted USPS looking for information we would get nowhere. Just the opposite was true of UPS. Always cooperative, always knowledgeable, always easy to contact.
I wish I had your experience.
I don’t ship anymore, but USPS lost enough packages that I wouldn’t use them if I had the chance.
Now I receive pretty often, and USPS loses at least one package a year. If I have the choice, I always specify UPS or Fedex. They’ve never lost one of my packages.
For me, the speed of delivery is less important than knowing when to expect the package. I’d rather have a firm 2 days or 3 days then a 1-5 days.
I do have more reliable USPS service when I have my packages delivered to my office rather than my home...
I will say that USPS’s tracking has improved significantly recently.