Interesting little factoid...which has very little to do with the actual post: FedEx actually carries the USPS priority mail on their aircraft. It is the first stuff off loaded and trucked immediately to the Post Office for delivery that day. At least, this was the case when I retired in 2011.
Aside from that, I'd just like to say all the delivery services have their place in the market, depending on what it is you need. Yes, you pay more for some, but usually you are paying for a "bigger" service. There are the occasional horror stories for each of them, and some people swear by only 1. (like me ...gotta keep those pension checks coming
) Also...this time of year is a nightmare for all the delivery services. Everyone is working hard. Have some fa-la-la and try to cut them a break!!