The ASRock B550 Steel Legend is the objective winner of this comparison, securing a higher number of superior specifications across the evaluated fields. Its most impactful advantage is the inclusion of PCIe x16 slots, which provides a 100% improvement over the alternative. This hardware configuration makes it the more robust choice for users prioritizing expansion capabilities and multi-card setups within their system architecture.

Users who require extensive expansion options should select the ASRock B550 Steel Legend for its superior PCIe slot count. Conversely, the MSI PRO B850M-A WIFI is the better option for those who prioritize memory capacity, as it offers a 100% advantage in maximum supported RAM. Choosing between these two motherboards depends entirely on whether your specific build requirements lean toward additional peripheral connectivity or higher total system memory support.