The ASRock Z890 Taichi is the objective winner of this comparison, securing a lead in seven out of eleven evaluated specifications. Its most impactful advantage is the inclusion of M.2 slots, which offer a 500% improvement over the alternative. This significant lead in storage connectivity establishes the ASRock Z890 Taichi as the superior choice for users requiring extensive high-speed drive support for their system builds.

Choose the ASRock Z890 Taichi if your primary requirement is maximizing internal storage capacity through its superior M.2 slot configuration. Conversely, the Gigabyte A620M DS3H is the better option for users who specifically prioritize the availability of PCIe x1 slots, where it maintains a 100% advantage. Select the Gigabyte A620M DS3H if your expansion needs are focused on these specific interface types rather than high-density storage arrays.