The MSI MEG X870E ACE MAX is the objective winner of this comparison, securing nine category victories against the three held by the ASRock B550 Steel Legend. The most significant technical advantage for the MSI MEG X870E ACE MAX is its LAN capability, which offers a 300% improvement over the alternative. Conversely, the ASRock B550 Steel Legend maintains a notable lead in expansion flexibility, providing 100% more PCIe x1 slots for specialized add-in cards.

Users requiring high-speed networking performance should prioritize the MSI MEG X870E ACE MAX for its superior LAN throughput. This board is the clear choice for those seeking the most advanced specifications across the majority of tested categories. Alternatively, the ASRock B550 Steel Legend remains the better option for builders who specifically need to populate multiple PCIe x1 slots for peripheral expansion, as it offers double the capacity of the MSI alternative in that specific area.