Today, CAT5e is the most common type of cabling used due to its flexibility and its ability to support Gigabit speeds at a cost-effective price. You have billions of meters of CAT5e deployed in the world. They can support up 1Gbps or up 2.5 Gbps .
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Long answer: All the cables provided with routers are Cat5e because all home grade routers have 1000 BASE-T (gigabit) etherent ports. Cat5e is rated to support 1gbps thus it will support the full speed of the port , thus there is no reason to ship it with a more expensive cable.
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