The MSI MPG A750G PCIE5 wins in 3 out of 9 comparable specs, with 5 ties. Its biggest advantage is Modular (50% better).
Pure Power 13 M 750W wins in 1 spec (ATX Version: 3% better).
Recommendation
Choose MPG A750G PCIE5 if you want the best overall performance — especially modular.
Choose Pure Power 13 M 750W if atx version matters more to you.