The Intel Core i5-13400F wins in 9 out of 14 comparable specs, with 2 ties. Its biggest advantage is L2 Cache (375% better).
Core i9-9900K wins in 3 specs (Base Clock: 44% better).
Recommendation
Choose Core i5-13400F if you want the best overall performance — especially l2 cache.
Choose Core i9-9900K if base clock matters more to you.
