The be quiet! Straight Power 12 850W and the Corsair SF850 are objectively tied, as both units secure an equal number of spec victories across the evaluated categories. The be quiet! Straight Power 12 850W holds a 20% advantage in MSRP, making it the more cost-effective option based on the provided data. Conversely, the Corsair SF850 maintains a 3% lead regarding its ATX version, offering a slight technical edge in that specific area of the power supply specification.

Choose the be quiet! Straight Power 12 850W if your primary goal is to minimize your initial expenditure, as it provides a significant 20% advantage in MSRP. Select the Corsair SF850 if you prioritize the latest ATX version standards for your build, as it holds a 3% lead in that category. Since both units are otherwise evenly matched across all other measured specifications, your decision should rest entirely on whether you value lower costs or updated ATX compatibility.