for what it's worth, both lately have had lousy service.
UPS - Package from Moss (California to Indiana) took the following route to
get to my door (Tracking numbers can be checked on the UPS website)
CA - Illinois - CA - Illinois - CA - Kentucky - CA - Indiana (the parts
have more miles than the car in the past several years)
USPS - One package containing some Lucas fuses sent to Arizona - MIA/ 5
USPS - One letter containing check for some parts sent to Illinois - MIA/ 2
At least I can track the UPS shipments.
Guess I'll try FEDEX next.