Intel Xeon D 1587 's Advantages
Lower TDP (65W vs 250W)
Intel Xeon Platinum 9221 's Advantages
Released 3 years and 2 months late
Higher specification of memory (DDR4-2933 vs DDR3)
Higher base frequency (2.1GHz vs 1.7GHz)
Larger L3 cache size (71.5MB vs 1.5MB)