The AMD Ryzen 7 5800X wins in 9 out of 14 comparable specs, with 2 ties. Its biggest advantage is L3 Cache (167% better).
Core i7-8700K wins in 3 specs (Max Turbo Power: 33% better).
Recommendation
Choose Ryzen 7 5800X if you want the best overall performance — especially l3 cache.
Choose Core i7-8700K if max turbo power matters more to you.
