The Western Digital WD Black SN8100 4TB is the objective winner of this comparison, securing more individual specification victories than its counterpart. While both drives share several identical technical attributes, the 4TB model provides the most significant performance advantage by offering 100% more capacity than the Western Digital WD Black SN8100 2TB. This substantial increase in storage space serves as the primary differentiator between the two options.

Users prioritizing maximum storage volume for large libraries or extensive file collections should choose the Western Digital WD Black SN8100 4TB to take advantage of its superior capacity. Conversely, those focused on budget efficiency should select the Western Digital WD Black SN8100 2TB, as it holds a 49% advantage in MSRP. Selecting between these two drives depends entirely on whether your primary requirement is increased data storage or a lower initial purchase cost.