The be quiet! Pure Power 13 M 850W and the MSI MPG A850G PCIE5 are objectively tied, as both units secure an equal number of spec victories across the evaluated categories. While the be quiet! Pure Power 13 M 850W holds a 3% advantage regarding its ATX version, the MSI MPG A850G PCIE5 provides a significantly more impactful benefit with a 50% advantage in modularity, making it the superior choice for cable management flexibility.

Users prioritizing the latest ATX standards should select the be quiet! Pure Power 13 M 850W for their build. Conversely, those who require a highly modular design to simplify cable routing and improve internal airflow should choose the MSI MPG A850G PCIE5. Since both power supplies offer identical performance across the remaining five comparable fields, the decision rests entirely on whether the user values the specific ATX version or the modularity advantage.