The Western Digital WD Black SN8100 4TB is the objective winner of this comparison, securing more individual specification victories than its competitor. The most impactful advantage offered by this drive is its capacity, which is 100% greater than that of the alternative. While the TeamGroup T-FORCE Z540 2TB holds its own in two categories, it ultimately falls behind in the majority of measured specifications compared to the higher-capacity model.

Users who prioritize maximum storage space should choose the Western Digital WD Black SN8100 4TB to take advantage of its superior capacity. Conversely, the TeamGroup T-FORCE Z540 2TB is the better option for budget-conscious buyers, as it provides a 56% advantage in MSRP. Selecting between these two drives depends entirely on whether your primary requirement is the ability to store more data or the benefit of a more favorable initial purchase price.