The Gigabyte Z890 AORUS MASTER is the objective winner of this comparison, securing nine wins across the evaluated specifications compared to the single win for the Gigabyte B660M DS3H DDR4. The most impactful advantage for the Z890 AORUS MASTER is its M.2 slot configuration, which offers a 150% improvement over the alternative. This significant expansion capability establishes it as the superior choice for users requiring extensive high-speed storage connectivity within their system build.

Users prioritizing budget constraints should select the Gigabyte B660M DS3H DDR4, as it holds an 82% advantage in MSRP. Conversely, the Gigabyte Z890 AORUS MASTER is the ideal component for enthusiasts or professionals who need to maximize their storage capacity through its superior M.2 slot count. Choosing between these two motherboards depends entirely on whether your primary requirement is minimizing initial costs or maximizing the number of available high-speed storage interfaces.