The ASRock X870 Steel Legend WiFi is the objective winner of this comparison, securing a lead in six of the fourteen evaluated categories. Its most significant advantage over the competition is the inclusion of M.2 slots, which represents a 100% increase in capacity. While both boards share several identical specifications, the superior storage connectivity provided by the ASRock X870 Steel Legend WiFi establishes it as the more robust option for users requiring extensive high-speed drive support.

Users who prioritize storage expansion should select the ASRock X870 Steel Legend WiFi to take advantage of its doubled M.2 slot count. Conversely, the MSI PRO B850M-A WIFI is the better choice for those who specifically require additional PCIe x1 slots, as it offers a 100% advantage in that category. Choosing between these two motherboards depends entirely on whether your build configuration demands more internal storage drives or a higher number of PCIe expansion cards.