The Samsung 990 EVO Plus 4TB is the objective winner of this comparison, securing victories in five out of seven measured specifications. Its most significant advantage is its storage capacity, which is 100% greater than that of the alternative. By offering double the space, this drive provides a substantial increase in total data volume for users who require extensive room for their files and applications compared to the Western Digital WD Black SN770 2TB.

Choose the Samsung 990 EVO Plus 4TB if your primary requirement is maximum storage capacity for large libraries or professional workloads. Conversely, the Western Digital WD Black SN770 2TB is the better option for budget-conscious users, as it holds a 64% advantage in MSRP. Select the latter if you prioritize a lower initial cost over the expanded storage space provided by the larger drive.