The ASRock B850 Steel Legend WiFi is the objective winner of this comparison, securing victories in ten out of fourteen evaluated categories. Its most significant advantage is its maximum memory capacity, which is 300% higher than that of the competing board. By outperforming the MSI PRO B660M-A WIFI DDR4 in the majority of technical specifications, the ASRock B850 Steel Legend WiFi establishes itself as the more robust and feature-rich option for users prioritizing high-capacity memory configurations.

Users who require extensive RAM support should choose the ASRock B850 Steel Legend WiFi to leverage its superior memory capacity. Conversely, the MSI PRO B660M-A WIFI DDR4 is the better selection for those who specifically need additional expansion capabilities, as it offers a 100% advantage in the number of available PCIe x1 slots. Selecting between these two motherboards depends entirely on whether your build prioritizes high-density memory or the need for extra PCIe expansion cards.