The Seagate Barracuda 4TB and the Western Digital WD Black SN850X 2TB result in an objective tie across the evaluated specifications. While both components secure two category wins each, they offer vastly different primary strengths. The Seagate Barracuda 4TB provides a significant advantage in storage capacity, offering 100% more space than its competitor. Conversely, the Western Digital WD Black SN850X 2TB delivers a massive performance lead, featuring a sequential read speed that is 3742% better.

Users prioritizing mass storage for large libraries or archival purposes should choose the Seagate Barracuda 4TB for its superior capacity. Those who require high-speed data access and prioritize rapid sequential read performance should select the Western Digital WD Black SN850X 2TB. Your decision should depend entirely on whether your specific workflow demands the maximum available space for files or the fastest possible read speeds for your system operations.