The ASRock H670 Steel Legend is the objective winner of this comparison, securing a lead in nine out of thirteen evaluated specifications. Its most significant technical advantage is the inclusion of PCIe x1 slots, which offer a 200% increase in capacity compared to the alternative. This superior connectivity profile establishes the board as the more robust option for users requiring extensive expansion capabilities for their system builds.

Choose the ASRock H670 Steel Legend if your primary requirement is maximizing internal expansion through additional PCIe x1 slots. Conversely, the Gigabyte B650M DS3H is the logical selection for budget-conscious builders, as it holds a 31% advantage in MSRP. By prioritizing cost efficiency over the higher slot count found on the ASRock model, the Gigabyte offering serves as a practical solution for those focused on minimizing initial hardware expenditure.