The Samsung 9100 Pro 8TB is the objective winner of this comparison, securing victory in five out of seven evaluated specifications. Its most significant advantage over the competition is its storage capacity, which is 100% greater than that of the alternative. By offering double the space, the Samsung 9100 Pro 8TB provides a substantial increase in total data volume for users requiring extensive high-capacity storage solutions for their systems.

Choose the Samsung 9100 Pro 8TB if your primary requirement is maximum storage density for large-scale data management. Conversely, select the Samsung 990 Pro 4TB if you prioritize cost efficiency, as it holds a 59% advantage in MSRP. While the latter offers less total capacity, it remains the superior choice for budget-conscious buyers who do not need the expanded storage footprint provided by the larger drive.