The AMD Ryzen 9 5900X wins in 9 out of 14 comparable specs, with 1 tie. Its biggest advantage is L3 Cache (300% better).
Core i9-9900K wins in 4 specs (Max Turbo Power: 33% better).
Recommendation
Choose Ryzen 9 5900X if you want the best overall performance — especially l3 cache.
Choose Core i9-9900K if max turbo power matters more to you.
