Intel Xeon W 2123 's Advantages
Higher base frequency (3.6GHz vs 2.1GHz)
Lower TDP (120W vs 330W)
Intel Xeon Platinum 8558 's Advantages
Released 6 years and 4 months late
Higher specification of memory (DDR5-5200 vs DDR4-2666)
Newer PCIe version (5 vs 3)
Larger L3 cache size (260MB vs 8.25MB)
More modern manufacturing process (7nm vs 14nm)