Intel Xeon W 2104's Advantages
Lower TDP (120W vs 125W)
Xeon W 1390P's Advantages
Released 3 years and 9 months late
Higher specification of memory (DDR4-3200 vs DDR4-2666)
Newer PCIe version (4 vs 3)
Higher base frequency (3.5GHz vs 3.2GHz)
Larger L3 cache size (16MB vs 8.25MB)