The Seasonic Prime TX-1300 ATX 3.1 wins in 5 out of 9 comparable specs, with 3 ties. Its biggest advantage is PCIe Connectors (150% better).
RM850x (2024) wins in 1 spec (MSRP: 61% better).
Recommendation
Choose Prime TX-1300 ATX 3.1 if you want the best overall performance — especially pcie connectors.
Choose RM850x (2024) if msrp matters more to you.
