The Samsung 9100 Pro 1TB is the objective winner of this comparison, securing victories in four out of seven evaluated specifications. Its most significant advantage is a 97% improvement in sequential read speeds compared to the alternative. While the Samsung 990 Pro 4TB leads in two categories, the superior read performance of the 9100 Pro 1TB makes it the more technically capable drive across the majority of the measured metrics.

Choose the Samsung 9100 Pro 1TB if your primary requirement is high-speed data access, as it offers a substantial performance lead in sequential read tasks. Conversely, select the Samsung 990 Pro 4TB if your priority is storage volume, as it provides a 300% advantage in total capacity. Your decision should depend on whether you value the raw speed of the 9100 Pro or the extensive storage space offered by the 990 Pro.