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 characteristics, the 4TB model provides a significant advantage in total storage space, offering 100% more capacity than the alternative. This substantial increase in available room for data is the most impactful differentiator between these two storage options.

Users prioritizing budget efficiency should select the Western Digital WD Black SN8100 2TB, as it holds a 49% advantage in MSRP. Conversely, those who require maximum storage density for large libraries or extensive file management should choose the 4TB version. By selecting based on these specific advantages, buyers can align their purchase with either the cost-saving benefits of the smaller drive or the superior capacity offered by the larger model.