The Intel Core Ultra 5 250KF Plus wins in 9 out of 14 comparable specs, with 2 ties. Its biggest advantage is L2 Cache (650% better).
Ryzen 7 5800X3D wins in 3 specs (L3 Cache: 220% better).
Recommendation
Choose Core Ultra 5 250KF Plus if you want the best overall performance — especially l2 cache.
Choose Ryzen 7 5800X3D if l3 cache matters more to you.
