The Samsung 990 Pro 4TB is the objective winner of this comparison, securing victories in four of the seven evaluated specifications. Its most significant advantage is its storage capacity, which is 100% greater than that of the alternative. By offering double the space of the competitor, this drive provides a substantial increase in total data volume for users who require extensive room for their files and applications.

Choose the Samsung 990 Pro 4TB if your primary requirement is maximum storage capacity for large-scale projects or extensive media libraries. Conversely, the Western Digital WD Black SN850X 2TB is the better option for budget-conscious buyers, as it holds a 59% advantage in MSRP. Select the Western Digital WD Black SN850X 2TB if you prioritize a lower initial cost over the expanded capacity offered by the larger drive.