Time or space?
In the run-up to their peak delivery seasons,
UPS and FedEx are emphasizing different aspects of reality,
according to the Wall Street Journal.
UPS will add surcharges to deliveries
mostly after December 17.
FedEx will charge more for "oversize boxes and odd-sized goods".
But
UPS also adds fees over certain weights and sizes.
And the FedEx rate adjustments announced on August 3
"take effect during the holiday shipping period of Nov. 20, 2017–Dec. 24, 2017." So the FedEX increases are also time-oriented.
The perceived differences are more a matter of rhetoric than physics.
Time and space.