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 superiority for users requiring high-volume storage solutions.

Choose the Samsung 9100 Pro 4TB if your primary requirement is maximum storage capacity for large files or extensive libraries. Conversely, select the Samsung 990 Pro 1TB if your priority is a lower MSRP, as it holds a 77% advantage in that specific category. This smaller drive is the logical choice for budget-conscious users who do not need the expansive capacity offered by the larger model.