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 offer a 100% improvement over the alternative. This hardware configuration provides a distinct edge for users prioritizing expansion capabilities and multi-card setups, establishing the board as the more versatile option for systems requiring extensive connectivity and peripheral support.

Users should select the ASRock B550 Steel Legend if their build requires the maximum number of PCIe x16 slots for specialized expansion cards. Conversely, the ASRock B850M PG Riptide WiFi is the better choice for those who prioritize system memory capacity, as it offers a 100% advantage in maximum memory support. Choosing between these two motherboards depends entirely on whether your specific workflow demands greater expansion slot availability or significantly higher total RAM capacity.