The AMD Ryzen 9 5900X wins in 9 out of 14 comparable specs, with 2 ties. Its biggest advantage is L3 Cache (433% better).
Core i7-8700K wins in 3 specs (MSRP: 35% better).
Recommendation
Choose Ryzen 9 5900X if you want the best overall performance — especially l3 cache.
Choose Core i7-8700K if msrp matters more to you.
