The MSI MAG X870 TOMAHAWK WIFI wins in 5 out of 14 comparable specs, with 7 ties. Its biggest advantage is USB Type-C (100% better).
MAG X670E TOMAHAWK WIFI wins in 2 specs (PCIe x1 Slots: 100% better).
Recommendation
Choose MAG X870 TOMAHAWK WIFI if you want the best overall performance — especially usb type-c.
Choose MAG X670E TOMAHAWK WIFI if pcie x1 slots matters more to you.
