The Western Digital WD Black SN8100 4TB is the objective winner of this comparison, securing victory in five out of seven measured specifications. Its most significant technical advantage is its sequential write speed, which outperforms the competition by 103%. While the Samsung 990 Pro 2TB holds a 69% advantage in MSRP, the superior performance metrics across the majority of categories establish the Western Digital drive as the more capable hardware option for high-demand storage tasks.

Users prioritizing raw performance and maximum capacity should select the Western Digital WD Black SN8100 4TB to leverage its substantial lead in sequential write speeds. Conversely, the Samsung 990 Pro 2TB is the appropriate choice for budget-conscious buyers who value the 69% advantage in MSRP over the performance gains offered by the alternative. Choosing between these two drives depends entirely on whether your primary requirement is top-tier write throughput or a more favorable initial purchase cost.