The AMD Ryzen 9 5950X wins in 10 out of 14 comparable specs, with 1 tie. Its biggest advantage is L3 Cache (611% better).
Core i5-8400 wins in 3 specs (MSRP: 77% better).
Recommendation
Choose Ryzen 9 5950X if you want the best overall performance — especially l3 cache.
Choose Core i5-8400 if msrp matters more to you.
