The Gigabyte B550 AORUS PRO AC is the objective winner of this comparison, securing more wins across the evaluated specifications. Its most significant advantage over the ASRock B760M PG Lightning is the inclusion of PCIe x16 slots, which provide a 200% improvement in that category. While both boards share several identical features, the Gigabyte B550 AORUS PRO AC offers superior expansion capabilities that distinguish it as the more versatile hardware option for system builders.

Users who prioritize extensive expansion and multi-card configurations should select the Gigabyte B550 AORUS PRO AC for its substantial lead in PCIe x16 slot capacity. Conversely, the ASRock B760M PG Lightning is the better choice for those who require higher memory density, as it offers a 100% advantage in maximum memory support. Choosing between these two motherboards depends entirely on whether your specific build requirements favor additional expansion slots or increased total system memory capacity.