The AMD Ryzen 5 7600X3D wins in 9 out of 14 comparable specs, with 3 ties. Its biggest advantage is L3 Cache (967% better).
Core i5-8400 wins in 2 specs (MSRP: 39% better).
Recommendation
Choose Ryzen 5 7600X3D if you want the best overall performance — especially l3 cache.
Choose Core i5-8400 if msrp matters more to you.
