The AMD Ryzen 9 9950X3D wins in 10 out of 14 comparable specs, with 1 tie. Its biggest advantage is L2 Cache (167% better).
Ryzen 9 5900X wins in 3 specs (TDP: 38% better).
Recommendation
Choose Ryzen 9 9950X3D if you want the best overall performance — especially l2 cache.
Choose Ryzen 9 5900X if tdp matters more to you.
