The Samsung 9100 Pro 4TB is the objective winner of this comparison, securing victory in five out of seven evaluated specifications. Its most significant advantage is its storage capacity, which is 300% greater than that of the alternative. By offering substantially more space for data, this drive provides a clear technical lead in overall utility and scale for high-demand storage environments.

Users who prioritize maximum storage volume should choose the Samsung 9100 Pro 4TB to accommodate large libraries and extensive file collections. Conversely, the Samsung 990 Pro 1TB is the better option for budget-conscious buyers, as it holds a 77% advantage in MSRP. Selecting between these two components depends entirely on whether your primary requirement is the expansive capacity of the larger drive or the cost-efficiency offered by the smaller model.