The Seasonic Prime TX-1300 ATX 3.1 is the objective winner of this comparison, securing more category victories than its competitor. While both power supplies offer competitive features, the most impactful advantage belongs to the Seasonic Prime TX-1300 ATX 3.1, which provides 20% better efficiency. This superior power management makes it the more refined choice for users prioritizing energy optimization and modern standards, despite the Corsair HX1500i offering a 15% advantage in total wattage capacity.

Choose the Corsair HX1500i if your build requires the highest possible power ceiling, as its wattage advantage is the primary reason to select it over the alternative. Conversely, select the Seasonic Prime TX-1300 ATX 3.1 if you prioritize the efficiency gains provided by its design. This unit is better suited for users who value the specific performance benefits of its architecture over the raw power output offered by the Corsair HX1500i.