AMD EPYC 7H12 's Advantages
Higher base frequency (2.6GHz vs 2.2GHz)
Lower TDP (280W vs 340W)
AMD EPYC 9734 's Advantages
Released 3 years and 9 months late
Higher specification of memory (DDR5-4800 vs DDR4-3200)
Newer PCIe version (5 vs 4)
More modern manufacturing process (5nm vs 7nm)