The Intel Core Ultra 9 285 wins in 6 out of 14 comparable specs, with 4 ties. Its biggest advantage is L2 Cache (233% better).
Ryzen 9 7900X3D wins in 4 specs (L3 Cache: 256% better).
Recommendation
Choose Core Ultra 9 285 if you want the best overall performance — especially l2 cache.
Choose Ryzen 9 7900X3D if l3 cache matters more to you.
