The Samsung 990 Pro 4TB is the objective winner of this comparison, securing victory across four of the seven evaluated specifications. While both drives share two tied metrics, the Samsung 990 Pro 4TB provides its most significant advantage in total storage capacity, which is 300% better than the alternative. Conversely, the Samsung 980 Pro 1TB maintains its primary edge in affordability, offering an MSRP that is 62% better than the higher-capacity model.

Users who prioritize maximum storage space for large libraries or professional workloads should choose the Samsung 990 Pro 4TB to leverage its superior capacity. This drive is the clear selection for those requiring extensive room for data. Alternatively, the Samsung 980 Pro 1TB is the appropriate choice for budget-conscious buyers who prefer a lower entry cost and do not require the massive storage volume provided by the larger model.