The Samsung 990 Pro 4TB is the objective winner of this comparison, securing victory across the majority of evaluated specifications. Its most impactful advantage is its storage capacity, which is 100% greater than that of the alternative. While the Samsung 980 Pro 2TB remains a viable option, it only outperformed the successor in a single category, specifically offering a 42% better MSRP. These results highlight a clear trade-off between total storage volume and initial cost.

Users who prioritize maximum data storage for large libraries or professional workloads should choose the Samsung 990 Pro 4TB to take advantage of its superior capacity. Conversely, the Samsung 980 Pro 2TB is the better selection for budget-conscious buyers who want to minimize their initial expenditure while still utilizing a high-performance storage solution. Your final decision should depend on whether you value doubling your available space or securing the more favorable MSRP.