Intel Xeon D 1518 's Advantages
Lower TDP (35W vs 140W)
Intel Xeon W 2175 's Advantages
Released 2 years and 7 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Higher base frequency (2.5GHz vs 2.2GHz)
Larger L3 cache size (19.25MB vs 1.5MB)