The MSI MPG X870E CARBON WIFI is the objective winner, securing victory in ten out of thirteen comparable specifications. Its most significant advantage over the Gigabyte B660M DS3H DDR4 is its maximum memory capacity, which is 300% higher. While the Gigabyte B660M DS3H DDR4 offers a 100% advantage in the number of PCIe x1 slots, the MSI MPG X870E CARBON WIFI dominates the overall feature set across the remaining technical categories.

Users requiring extensive memory support should choose the MSI MPG X870E CARBON WIFI for its superior capacity. Conversely, the Gigabyte B660M DS3H DDR4 is the appropriate selection for builders who prioritize a higher count of PCIe x1 slots for their specific expansion card requirements. Selecting between these two motherboards depends entirely on whether your build demands maximum system memory or additional connectivity through smaller expansion slots.