The ASRock B760M PG Lightning is the objective winner of this comparison, securing more total spec victories than its competitor. Its most significant advantage is a 300% higher maximum memory capacity, which provides a substantial edge for memory-intensive workloads. While the MSI PRO B660M-A WIFI DDR4 holds its own across several tied categories, the ASRock B760M PG Lightning ultimately offers superior technical specifications for users prioritizing high-capacity system memory.

Users who require extensive RAM support for demanding applications should choose the ASRock B760M PG Lightning to leverage its memory capacity advantage. Conversely, the MSI PRO B660M-A WIFI DDR4 is the better selection for those who specifically need more expansion options, as it provides a 100% advantage in available PCIe x1 slots. Selecting between these two motherboards depends entirely on whether your build prioritizes large memory configurations or additional peripheral connectivity.