I have had trouble with all of them. The more you ship the more likely you will have issues. The harder the shipping system is pressed the more likely you will have issues. (COVID-19 and people ordering everything on line)
If the parts are super rare then don’t be cheap and Double box them and insure the shipment. Shipments that are insured get flagged in the system and are also flagged for handling.
But things still happen. UPS lost a big deposit check I had shipped Next Day Air and the sale nearly collapsed because of the problem. I stopped payment and reissued the check to only to have UPS find it under a conveyor that broke and despite the tracking number being flagged they delivered it to the point of sale a full 8 weeks after it went missing.
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