The Samsung 990 Pro 4TB is the objective winner, securing victories in four out of six measured specifications. Its most significant advantage is a 1230% improvement in sequential read speeds compared to the Samsung 870 EVO 2TB. While the latter remains competitive in specific areas, the former establishes clear dominance in raw data throughput, making it the superior choice for users prioritizing high-speed performance and expanded storage capacity in their system builds.

Choose the Samsung 990 Pro 4TB if your primary requirement is maximum sequential read performance for demanding tasks. Conversely, the Samsung 870 EVO 2TB is the better option for budget-conscious users, as it offers a 62% advantage in MSRP. Select the former for high-end speed requirements or the latter if you prefer a more cost-effective storage solution that balances essential functionality with a lower initial financial commitment.