The Samsung 990 EVO Plus 4TB and the Western Digital WD Black SN850X 1TB reach a stalemate in this comparison, as both drives secure an equal number of spec victories. The primary differentiator between these two storage solutions is their distinct architectural focus. The Samsung 990 EVO Plus 4TB offers the most significant advantage in total storage space, providing 300% more capacity than its competitor, while the Western Digital WD Black SN850X 1TB features a 100% superior DRAM cache configuration.

Users requiring extensive storage for large libraries or massive file collections should prioritize the Samsung 990 EVO Plus 4TB for its substantial capacity lead. Conversely, those who prioritize the performance benefits of a dedicated DRAM cache should select the Western Digital WD Black SN850X 1TB. Choosing between these components depends entirely on whether your specific workflow demands the maximum available volume for data retention or the technical advantages provided by the integrated cache.