The AMD Ryzen 9 9900X3D wins in 2 out of 14 comparable specs, with 11 ties. Its biggest advantage is Process Node (20% better).
Ryzen 9 7900X3D wins in 1 spec (Boost Clock: 2% better).
Recommendation
Choose Ryzen 9 9900X3D if you want the best overall performance — especially process node.
Choose Ryzen 9 7900X3D if boost clock matters more to you.
