The ASUS ROG THOR 1200W Platinum III and the Corsair HX1200i are objectively tied, as both units share identical specifications across five of the seven measured categories. The primary differentiator for the ASUS ROG THOR 1200W Platinum III is its ATX version, which offers a 3% advantage in that specific metric. Conversely, the Corsair HX1200i holds a significant lead in affordability, providing a 40% advantage regarding its MSRP compared to the alternative.

Users prioritizing the latest hardware standards should select the ASUS ROG THOR 1200W Platinum III for its superior ATX version compatibility. Alternatively, those focused on budget efficiency should choose the Corsair HX1200i, as its MSRP advantage makes it the more economical option. Since both power supplies offer equivalent performance across the majority of technical specifications, the final decision rests entirely on whether the user values the updated ATX standard or the substantial cost savings.