The Samsung 990 Pro 4TB is the objective winner of this comparison, securing five out of seven total specification categories. Its most significant advantage over the competition is its storage capacity, which is 300% greater than that of the alternative. By offering substantially more room for data, the Samsung 990 Pro 4TB provides a clear technical lead in terms of total volume, making it the superior choice for users who prioritize high-capacity storage solutions for their systems.

The Silicon Power UD90 1TB is the recommended option for budget-conscious users, as it holds an 87% advantage in MSRP compared to the Samsung 990 Pro 4TB. Those who require a smaller storage footprint and want to minimize their initial expenditure should select the Silicon Power UD90 1TB. Conversely, power users who need the maximum possible capacity for large files and extensive libraries should opt for the Samsung 990 Pro 4TB to leverage its superior storage volume.