The Western Digital WD Black SN8100 4TB is the objective winner of this comparison, securing more individual specification victories than its competitor. While the Samsung 990 Pro 4TB with Heatsink holds a notable advantage in MSRP, which is 31% better, the Western Digital WD Black SN8100 4TB provides a significantly higher level of performance in its primary area of strength. Specifically, the Western Digital drive offers a sequential write speed that is 103% better than the Samsung alternative.

Users who prioritize maximum sequential write performance for their storage tasks should choose the Western Digital WD Black SN8100 4TB to take advantage of its superior speed capabilities. Conversely, the Samsung 990 Pro 4TB with Heatsink is the better option for budget-conscious buyers who want to capitalize on its 31% better MSRP. Selecting between these two drives depends entirely on whether your primary requirement is raw write throughput or a more favorable initial purchase cost.