The AMD Ryzen 5 9600 wins in 7 out of 14 comparable specs, with 4 ties. Its biggest advantage is MSRP (54% better).
Ryzen 9 3900X wins in 3 specs (Total Cores: 100% better).
Recommendation
Choose Ryzen 5 9600 if you want the best overall performance — especially msrp.
Choose Ryzen 9 3900X if total cores matters more to you.
