The Gigabyte A620M DS3H is the objective winner of this comparison, securing more total specification victories across the evaluated fields. Its most significant advantage over the competition is the inclusion of PCIe x1 slots, which offer a 100% improvement in that specific connectivity category. While both motherboards share several identical specifications, the Gigabyte A620M DS3H provides a more robust foundation for users prioritizing expansion capabilities through these additional slots.

Choose the Gigabyte A620M DS3H if your build requires the extra PCIe x1 slots for peripheral expansion. Conversely, the Gigabyte B660M DS3H DDR4 is the superior option for users who prioritize networking performance, as it features a LAN specification that is 150% better than the alternative. Selecting between these two components should depend entirely on whether your specific system configuration demands greater internal expansion or enhanced wired network connectivity.