The MSI MEG Z890 ACE wins in 7 out of 14 comparable specs, with 4 ties. Its biggest advantage is USB Type-C (200% better).
MAG X670E TOMAHAWK WIFI wins in 3 specs (PCIe x1 Slots: 100% better).
Recommendation
Choose MEG Z890 ACE if you want the best overall performance — especially usb type-c.
Choose MAG X670E TOMAHAWK WIFI if pcie x1 slots matters more to you.
