The Lexar NM1090 Pro 2TB is the objective winner of this comparison, securing more individual specification victories than its competitor. Its most significant technical advantage is its sequential read speed, which outperforms the Samsung 990 Pro 4TB by 88 percent. This substantial lead in data retrieval performance establishes the Lexar drive as the superior choice for users prioritizing raw speed and responsiveness in their storage operations.

Users who require the fastest possible sequential read performance should select the Lexar NM1090 Pro 2TB for their system. Conversely, the Samsung 990 Pro 4TB is the better option for those who prioritize storage volume, as it offers a 100 percent advantage in total capacity. Choosing between these two components depends entirely on whether your primary requirement is the high-speed data access of the Lexar or the doubled storage space provided by the Samsung.