The Corsair RM1200x SHIFT is the objective winner of this comparison, securing more category wins across the evaluated specifications. Its most impactful advantage is the inclusion of SATA connectors, which provides a 33% improvement over the alternative. This feature makes the unit a more versatile choice for systems requiring extensive peripheral connectivity, ensuring that users have sufficient ports for multiple storage drives and accessories without needing additional adapters or splitters.

Choose the Corsair RM1200x SHIFT if your build prioritizes peripheral expansion and connectivity options. Conversely, select the NZXT C1500 Platinum if your primary requirement is raw power delivery, as it offers a 25% advantage in total wattage. This higher capacity makes the NZXT C1500 Platinum the superior option for high-draw configurations that demand maximum power overhead, while the Corsair model remains the better-rounded choice for standard setups needing more SATA support.