I stopped using FedEx when I checked on a preamp delivery and it was marked as delivered but wasn’t. I called FedEx and was told that late in the day drivers might mark something as delivered when they plan to deliver it the next day. Since I paid for 2-day delivery, I was not happy. My conversation with FedEx did not go well.
The next day, still no delivery. I called FedEx again. Support said they would contact the driver. Later that day, a lady in our development rang my doorbell. She delivered my $7K preamp. FedEx did deliver it on the right day, but to the wrong house. I never did hear back from FedEx support.
I’ve been pretty lucky with UPS and have had zero problems with the USPS.