The ASRock H670 Steel Legend is the objective winner of this comparison, securing a lead in eight out of thirteen evaluated specifications. Its most significant advantage is the inclusion of additional memory slots, which represents a 100% improvement over the alternative. This hardware configuration provides a clear technical edge for users prioritizing expansion capabilities and system memory capacity within their build, establishing the ASRock H670 Steel Legend as the superior choice for those requiring more robust connectivity options.

The MSI PRO B660M-A WIFI DDR4 is the preferred option for budget-conscious builders, as it offers a 25% advantage in MSRP compared to its competitor. Users who prioritize cost savings over maximum memory expansion should select the MSI PRO B660M-A WIFI DDR4. Conversely, those who require the increased memory slot capacity provided by the ASRock H670 Steel Legend should choose that model to better support their specific hardware requirements.