The Gigabyte Z790 AORUS ELITE AX is the objective winner of this comparison, securing a higher count of superior specifications across the evaluated fields. Its most impactful advantage over the alternative is the inclusion of integrated Wi-Fi, which represents a 100% improvement in connectivity capability. While the Gigabyte B850 GAMING X holds its own in several categories, the Z790 AORUS ELITE AX provides a more robust feature set for users requiring modern wireless networking standards.

Choose the Gigabyte Z790 AORUS ELITE AX if your primary requirement is built-in Wi-Fi connectivity for your system setup. Conversely, the Gigabyte B850 GAMING X is the better selection for users who prioritize expansion options, as it offers a 100% advantage in the number of available PCIe x1 slots. Selecting between these two motherboards should depend entirely on whether your specific build configuration favors integrated wireless networking or additional physical expansion capacity.