The Samsung 990 Pro 4TB is the objective winner of this comparison, securing more individual specification victories than its counterpart. While both drives share identical performance characteristics across most metrics, the 4TB model provides a significant advantage in total storage capacity, which is 300% greater than the 1TB version. This makes the larger drive the superior choice for users who prioritize maximum data density and long-term storage headroom within a single M.2 slot.

The Samsung 990 Pro 1TB is the better option for budget-conscious buyers, as it holds a 68% advantage in MSRP compared to the higher-capacity model. Users who do not require extensive storage space can leverage this cost efficiency while retaining the same technical specifications. Conversely, the 4TB variant is the clear recommendation for power users, content creators, or gamers who need to store massive libraries without the constraints of a smaller drive.