FedEx - reliable, reasonably priced, and friendly drivers
They have no problem delivering my package to my apt rental office when I'm not home. It seems to be a huge issue for UPS to do it.
USPS is ok, but the lines at my post office seem to be endless no matter if it's holiday time or not. It's worth the extra few $$ to send it FedEX so I can get in and out fast AND get an updated tracking number.