Intel Xeon Platinum 9221 's Advantages
Lower TDP (250W vs 330W)
Intel Xeon Platinum 8558 's Advantages
Released 4 years and 8 months late
Higher specification of memory (DDR5-5200 vs DDR4-2933)
Newer PCIe version (5 vs 3)
Larger L3 cache size (260MB vs 71.5MB)
More modern manufacturing process (7nm vs 14nm)