The AMD Ryzen 9 3900X wins in 6 out of 14 comparable specs, with 5 ties. Its biggest advantage is L3 Cache (300% better).
Ryzen 7 5700G wins in 3 specs (TDP: 38% better).
Recommendation
Choose Ryzen 9 3900X if you want the best overall performance — especially l3 cache.
Choose Ryzen 7 5700G if tdp matters more to you.
