Intel Xeon E3 1285 v3 's Advantages
Higher base frequency (3.6GHz vs 3.3GHz)
Lower TDP (84W vs 140W)
Intel Xeon W 2155 's Advantages
Released 4 years and 2 months late
Higher specification of memory (2666 vs 4)
Larger L3 cache size (13.75MB vs 8MB)
More modern manufacturing process (14nm vs 22nm)