The Seasonic Prime TX-850 wins in 5 out of 9 comparable specs, with 1 tie. Its biggest advantage is SATA Connectors (133% better).
Pure Power 13 M 850W wins in 3 specs (12VHPWR Connector: 100% better).
Recommendation
Choose Prime TX-850 if you want the best overall performance — especially sata connectors.
Choose Pure Power 13 M 850W if 12vhpwr connector matters more to you.
