The be quiet! Pure Power 13 M 850W and the be quiet! Straight Power 12 850W result in an objective tie across the evaluated specifications. While both units share equal standing in the majority of categories, each offers a distinct primary benefit. The be quiet! Pure Power 13 M 850W holds a 19% advantage in MSRP, making it the more cost-effective choice, whereas the be quiet! Straight Power 12 850W provides a 50% advantage in modularity.

Users prioritizing budget efficiency should select the be quiet! Pure Power 13 M 850W to take advantage of its lower MSRP. Conversely, those who require superior cable management flexibility should opt for the be quiet! Straight Power 12 850W due to its significant lead in modularity. Since both power supplies perform identically across most metrics, the final decision rests entirely on whether the user values initial cost savings or the convenience of a more modular design.