The Western Digital WD Black SN8100 4TB is the objective winner of this comparison, securing more category victories than its counterpart. Its most significant technical advantage is its sequential write speed, which outperforms the Western Digital WD Black SN850X 4TB by 112 percent. This substantial lead in write performance establishes the SN8100 as the superior option for users prioritizing raw data throughput and high-speed file operations within their storage configuration.

Users who require the fastest possible write speeds for intensive data tasks should choose the Western Digital WD Black SN8100 4TB. Conversely, the Western Digital WD Black SN850X 4TB remains a viable alternative for budget-conscious buyers, as it holds a 31 percent advantage in MSRP. Selecting between these two drives depends on whether your primary requirement is the maximum sequential write capability offered by the SN8100 or the lower cost provided by the SN850X.