The ASRock X870 Steel Legend WiFi is the objective winner of this comparison, securing more individual specification victories than the ASRock B550 Steel Legend. While both boards share several identical features, the X870 Steel Legend WiFi provides a significant advantage in system capacity, offering 100% more maximum memory support than its counterpart. This increased memory ceiling represents the most impactful technical improvement between the two motherboards, establishing the newer model as the superior option for high-capacity configurations.

Users who prioritize future-proofing and high-density memory setups should choose the ASRock X870 Steel Legend WiFi to take advantage of its superior memory capacity. Conversely, the ASRock B550 Steel Legend remains the logical choice for builders who require additional expansion options, as it offers 100% more PCIe x1 slots than the newer model. Selecting between these two components depends entirely on whether your specific build requires greater memory overhead or increased connectivity for peripheral expansion cards.