UPS is the most unreliable, and trying to reach and get a response to missing items has been hard.
I disagree. I’ve never had a problem with UPS including shipments of powder and primers. On the other hand FedEx seems to misplace every shipment. In the last year they lost an entire set of tires and were 4-5 days late on every other shipment (including the replacement tires). Every shipment shows it will arrive today then dissappears into limbo for 3-4 days before finally showing up.