Intel Xeon D 1521 's Advantages
Higher base frequency (2.4GHz vs 2.3GHz)
Lower TDP (45W vs 250W)
Intel Xeon Platinum 9222 's Advantages
Released 3 years and 5 months late
Higher specification of memory (DDR4 vs DDR3)
Larger L3 cache size (71.5MB vs 1.5MB)