The Samsung 990 Pro 4TB is the objective winner of this comparison, securing more individual specification victories than the smaller model. While both drives share identical performance characteristics across most metrics, the 4TB variant provides the most significant advantage by offering 300% more storage capacity. This substantial increase in space is the primary differentiator between the two drives, as the 1TB model only holds a 68% advantage regarding its MSRP.

Users who prioritize maximum storage density for large libraries or professional workloads should select the Samsung 990 Pro 4TB to take advantage of its superior capacity. Conversely, the Samsung 990 Pro 1TB is the better choice for budget-conscious buyers who want the core performance of this drive series while benefiting from a 68% better MSRP. Your decision should rely entirely on whether you require the expanded capacity or prefer the lower initial cost.