The ASRock B550 Steel Legend is the objective winner of this comparison, securing a lead in six out of eleven evaluated specifications. Its most significant advantage over the competition is the inclusion of M.2 slots, which provides a 200% improvement in storage expansion capability. This hardware configuration makes it the superior choice for users who prioritize extensive drive connectivity and overall motherboard versatility within their system build.

Users who require maximum storage capacity should choose the ASRock B550 Steel Legend for its superior M.2 slot count. Conversely, the Gigabyte A620M DS3H is the better option for those prioritizing high-frequency memory performance, as it offers a 63% advantage in maximum memory speed. Selecting between these two components depends entirely on whether your specific build requirements lean toward increased storage expansion or faster memory support.