The Intel Core Ultra 5 250KF Plus wins in 11 out of 14 comparable specs, with 1 tie. Its biggest advantage is L2 Cache (1900% better).
Core i5-8400 wins in 2 specs (Max Turbo Power: 59% better).
Recommendation
Choose Core Ultra 5 250KF Plus if you want the best overall performance — especially l2 cache.
Choose Core i5-8400 if max turbo power matters more to you.
