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Worth noting that UPS/FedEx/USPS each has its own shipping niches.

YMMV, but I've generally found that FedEx for home delivery of larger packages is cheaper than UPS and USPS, who each charge a surcharge for residential delivery vs commercial delivery. If you need to ship things overnight, FedEx's air/express prices are a competitive advantage.

USPS is very price-competitive if you are able to use their standard sized packaging, their "flat rate boxes".

For shipping larger items via ground, UPS still generally has that niche. Worth noting that if you do large volumes of smaller items, say the size of a book, UPS Surepost combines UPS's speed with USPS last-mile delivery.