The ASRock H670 Steel Legend is the objective winner of this comparison, securing more total specification victories than its competitor. Its most impactful advantage is the inclusion of M.2 slots, which offer a 100% improvement over the MSI MAG B550 TOMAHAWK. This significant increase in high-speed storage connectivity makes the ASRock H670 Steel Legend the superior choice for users prioritizing modern drive configurations and expanded internal storage capacity within their system builds.

Users who require extensive high-speed storage should select the ASRock H670 Steel Legend to utilize its superior M.2 slot count. Conversely, the MSI MAG B550 TOMAHAWK remains the better option for those who prioritize legacy storage connectivity, as it provides a 50% advantage in available SATA ports. Choosing between these two motherboards depends entirely on whether your specific build requirements lean toward modern M.2 drive density or a higher volume of traditional SATA-based storage devices.