The MSI MEG Z890 ACE is the objective winner of this comparison, securing victory across eight of the thirteen evaluated specifications. Its most significant technical advantage is the USB Type-C connectivity, which offers a 200% improvement over the alternative. While the ASRock B550 Steel Legend holds its own in specific areas, the MSI MEG Z890 ACE provides a more robust feature set across the majority of the measured hardware categories.

Users who prioritize modern peripheral connectivity and high-speed data transfer should select the MSI MEG Z890 ACE for its superior USB Type-C implementation. Conversely, the ASRock B550 Steel Legend is the better choice for builders who require additional expansion options, as it provides a 100% advantage in the number of available PCIe x1 slots. Your final decision should depend on whether your build requires more legacy expansion cards or advanced external device support.