The ASRock X870 Steel Legend WiFi is the objective winner of this comparison, securing more total spec victories across the evaluated fields. Its most significant advantage is the inclusion of PCIe x16 slots, which offer a 100% improvement over the alternative. This hardware configuration provides a clear lead in primary expansion capabilities, making it the superior choice for users who prioritize high-bandwidth connectivity for their core components and graphics hardware.

Users who require maximum capacity for primary expansion cards should select the ASRock X870 Steel Legend WiFi for its superior PCIe x16 slot count. Conversely, the MSI PRO B850M-A WIFI is the better option for those who specifically need more PCIe x1 slots, as it provides a 100% advantage in that category. Choosing between these two motherboards depends entirely on whether your build configuration relies on high-speed primary slots or additional secondary expansion connectivity.