Cramer made his remarks after the package delivery giant announced it plans to buy TNT Express, a Netherlands-based courier, for $4.8 billion. FedEx's stock was up about 3.3 percent in midmorning trading.
"I thought this was fabulous. I thought FedEx was not even up enough in premarket trading," Cramer added. "FedEx is such a smart company. It's been a dramatic outperformer versus UPS. UPS has done nothing [and they] missed two holiday seasons."
UPS' stock is up about 0.4 percent in the last six months, while FedEx's has risen nearly 7 percent.