The Seagate Barracuda 8TB is the objective winner of this comparison, securing three out of five total specification categories. While the Samsung 990 EVO Plus 4TB offers a significant performance edge, the most impactful advantage belongs to the Seagate Barracuda 8TB, which provides 100% more storage capacity than its competitor. This makes the Seagate drive the superior choice for users prioritizing maximum space for their data libraries over raw transfer speeds.

Users who require massive amounts of storage for archival purposes or large file collections should select the Seagate Barracuda 8TB for its superior capacity. Conversely, those who prioritize high-speed data access should choose the Samsung 990 EVO Plus 4TB, as it delivers a 3716% advantage in sequential read performance. Selecting between these two drives depends entirely on whether your primary requirement is the ability to store the largest volume of files or the fastest retrieval of data.