-- AMD motherboards use AMD CPUs, and often, AMD chipsets, for controlling memory and the PCI/PCIe lanes.
-- Intel boards use Intel CPUs and, often Intel chipsets, for controlling memory and the PCI/PCIe lanes.
Asking which is better may start a forum battle. I do not want to start such a battle, so, in general, at this time:
-- Intel usually costs much more than AMD
-- Currently, the top-end Intel outperforms the top-end AMD-based systems.
-- So, if you have the money to pay more for that increased performance, you would buy Intel.
-- If your budget is lower, you buy AMD for much less, and only slightly less performance.