The ASRock B550 Steel Legend is the objective winner of this comparison, securing more victories across the evaluated technical specifications. Its most significant advantage over the competition is the inclusion of PCIe x16 slots, which offer a 100% improvement in quantity. This hardware configuration provides a clear edge for users who prioritize expansion capabilities and multi-card setups, establishing the board as the superior choice based on the total count of winning features.

Users requiring extensive expansion options should select the ASRock B550 Steel Legend for its superior PCIe x16 slot capacity. Conversely, those who prioritize high-density system memory should opt for the ASRock B760M PG Lightning, as it provides a 100% advantage in maximum memory support. Choosing between these two motherboards depends entirely on whether your specific build requirements lean toward additional expansion slots or a higher ceiling for total system memory capacity.