The ASUS ROG STRIX Z590-E GAMING WIFI is the objective winner of this comparison, securing a lead in seven out of thirteen evaluated specifications. Its most significant technical advantage is the inclusion of PCIe x16 slots, which offer a 200% improvement over the alternative. This superior slot configuration provides greater expansion potential for users requiring multiple high-bandwidth add-in cards, establishing the motherboard as the more robust hardware platform for complex system builds.

Choose the ASUS ROG STRIX Z590-E GAMING WIFI if your primary requirement is maximum expansion capability through its superior PCIe x16 slot count. Conversely, select the Gigabyte B660M DS3H DDR4 if your priority is a more accessible entry point, as it holds a 76% advantage in MSRP. This makes the latter a more suitable option for budget-conscious builders who do not require the extensive connectivity and expansion features found on the higher-spec model.