The Corsair AX1600i is the objective winner of this comparison, securing more individual specification victories than its competitor. Its most significant advantage is its total power output, which provides 86% more wattage than the alternative. This substantial capacity makes it the superior choice for high-demand systems requiring extensive power delivery. While the Fractal Design Ion+ 2 Platinum 860W falls behind in total wattage, it remains a competitive option for users prioritizing cost-efficiency, boasting a 74% better MSRP.

Choose the Corsair AX1600i if you are building a high-performance workstation or a system with multiple power-hungry components that necessitate maximum wattage. Conversely, select the Fractal Design Ion+ 2 Platinum 860W if your build requirements are met by a lower power ceiling and you prefer a more budget-friendly purchase price. Both units offer comparable performance across the majority of their shared specifications, allowing you to prioritize either raw power capacity or initial acquisition cost.