The Samsung 990 Pro 4TB is the objective winner of this comparison, securing victories in four 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 room for data, the Samsung 990 Pro 4TB provides a clear technical lead for users requiring high-volume storage solutions compared to the smaller capacity offered by the Western Digital WD Black SN850X 1TB.

Choose the Samsung 990 Pro 4TB if your primary requirement is maximum storage capacity for large libraries or extensive file management. Conversely, the Western Digital WD Black SN850X 1TB is the better option for budget-conscious buyers, as it holds a 77% advantage in MSRP. Select the Western Digital WD Black SN850X 1TB if you prioritize a lower initial cost over the expansive storage space provided by the larger drive.