The ASRock Z890 Taichi is the objective winner of this comparison, securing a lead in seven out of thirteen evaluated specifications. Its most significant technical advantage over the ASRock H670 Steel Legend is the inclusion of USB Type-C connectivity, which offers a 200% improvement in that specific category. While the ASRock H670 Steel Legend maintains a 100% advantage in the number of PCIe x1 slots, the ASRock Z890 Taichi dominates the majority of the remaining hardware metrics.

Users who prioritize modern peripheral connectivity and high-end interface standards should select the ASRock Z890 Taichi for their build. Conversely, the ASRock H670 Steel Legend is the more suitable choice for individuals whose specific system requirements rely heavily on the availability of additional PCIe x1 slots. By evaluating these distinct hardware advantages, builders can align their motherboard selection with their specific needs for either expanded peripheral support or specialized internal expansion capabilities.