The Samsung 990 Pro 4TB is the objective winner of this comparison, securing more individual specification victories than its counterpart. While both drives share several identical technical attributes, the 4TB model provides the most significant advantage by offering 100% more storage capacity than the Samsung 990 Pro 2TB. This substantial increase in available space serves as the primary differentiator between the two storage options when evaluating their overall technical capabilities.

Users who prioritize maximum storage volume for large libraries or extensive data sets should select the Samsung 990 Pro 4TB to take advantage of its doubled capacity. Conversely, those who are more constrained by initial costs should opt for the Samsung 990 Pro 2TB, which holds a 51% advantage in MSRP. Choosing between these drives depends entirely on whether your primary requirement is the expanded capacity of the larger model or the improved pricing of the smaller one.