It appears that my experience with UPS has been better than most .....
However, international shipping is definitely less expensive using the USPS.
The primary reason I use UPS most of the time is that the local Staples office supply store is a UPS agent and just a couple of minutes from my home / shop. The gent behind the counter is super friendly and helpful and we are on a first name basis.
The folks at USPS are also very friendly ..... but there is one old fellow at the counter who has to struggle to pick up a carton containing a pair of my Betsy baffles .....
I have also been unusually fortunate as to damages .....
Of the hundreds of pairs of speakers shipped, there was only one mishap. UPS managed to run the tine of a forklift through the carton and nick the base of one of the speakers.
Someone had told me that the "magic number" for claims was $100.00 ..... so I turned in a claim for that amount. They sent me a check and I sent the money to the customer who just happened to have a woodworking shop and was able to repair the damage .....

Of course, the fact that I use custom fitted PE foam "channels" to secure the speakers and line the entire interior of the carton with 1/8" hardboard probably has a lot to do with the low incidence of damages.
If I was a superstitious person, I would now be concerned that I probably just cursed myself and the next ten pairs of speakers I ship will end up in the UPS trash compacter .....
Happy listening,
Randy