As a transportation professional responsible for moving hundreds of packages each week via small package carriers, you will find that the base charges for both UPS and FedEx Ground are virtually identical. FedEx Home Delivery delivers on a Tuesday-Saturday week versus a Monday-Friday week for UPS and regular FedEx Ground. The service via both carriers is also comparable. Keep in mind that their stated transit times are based on working days, not calendar days. One needs to check all of the fine print for the additional charges that both carriers charge for residential deliveries, rural areas, low population areas and other unusual points. Whichever is closest or more easily available to you would work fine. USPS would not be a good option.
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Why change balls? I can miss my target with any of them!