The ASRock B850 Steel Legend WiFi is the objective winner of this comparison, securing victories in seven out of eleven evaluated categories. Its most significant technical advantage is the inclusion of M.2 slots, which offer a 200% improvement over the alternative. This superior storage expandability makes it the more robust choice for users requiring high-density data configurations or multiple high-speed drives within their system build.

Users prioritizing extensive storage options should select the ASRock B850 Steel Legend WiFi for its clear advantage in M.2 connectivity. Conversely, the Gigabyte A620M DS3H is the better option for those who specifically require additional expansion cards, as it provides a 100% advantage in PCIe x1 slots. Choosing between these two motherboards depends entirely on whether your build demands more internal storage capacity or a higher number of specialized peripheral expansion slots.