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 significant advantage is the inclusion of PCIe x16 slots, which offer a 100% improvement over the alternative. This hardware configuration provides a distinct structural edge for users requiring additional expansion capabilities, making it the more versatile choice for systems that rely on multiple high-speed add-in cards for specialized tasks.

Users prioritizing expansion should select the ASRock B550 Steel Legend for its superior PCIe slot count. Conversely, the MSI PRO B860M-A WIFI is the better option for those who prioritize memory performance, as it offers a 54% advantage in maximum memory speed. Choosing between these two motherboards depends entirely on whether your specific build requirements lean toward the increased connectivity of the former or the faster memory support provided by the latter.