The Western Digital WD Black SN8100 4TB is the objective winner of this comparison, securing victories in five out of seven measured specifications. Its most significant performance advantage is its sequential write speed, which is 112% better than the alternative. By outperforming the Western Digital WD Black SN850X 2TB with Heatsink across the majority of technical categories, this drive establishes itself as the superior option for users prioritizing raw data throughput and high-capacity storage performance.

Users who require maximum sequential write capabilities and the highest storage capacity should choose the Western Digital WD Black SN8100 4TB. Conversely, the Western Digital WD Black SN850X 2TB with Heatsink is the better choice for budget-conscious buyers, as it holds a 66% advantage in MSRP. Select the former for peak performance requirements or the latter if minimizing the initial purchase cost is the primary objective for your storage configuration.