The Western Digital WD Black SN8100 2TB is the objective winner of this comparison, securing victories in five out of seven measured specifications. Its most significant advantage is its sequential write performance, which is 122% better than that of the alternative. This substantial lead in write capability establishes it as the superior choice for users prioritizing raw data throughput and high-capacity storage performance in their system builds.

Choose the Western Digital WD Black SN8100 2TB if your primary requirement is maximum sequential write speed and increased storage capacity. Conversely, select the Western Digital WD Black SN850X 1TB if your main priority is the MSRP, which is 71% better than the larger drive. This makes the smaller model a more cost-effective option for users who do not require the higher performance or capacity offered by the SN8100.