USPS consistently rings my doorbell and makes sure packages are handed to me rather than left outside.
Amazon delivered packages have been: thrown from the street; arrive crushed, punctured, or otherwise damaged; left in the driveway; left in the neighbors yard; never ring the doorbell, unless it's after dark, and then they ring and run.
Amazon's last mile service is a complete shit show, impressively worse than the random cut rate last mile delivery services they used when they were trying to force UPS and FedEx to lower prices.