Intel Xeon E5 2686 v3 's Advantages
Larger L3 cache size (45MB vs 24.75MB)
Lower TDP (120W vs 140W)
Intel Xeon W 2191B 's Advantages
Released 3 years and 3 months late
Higher specification of memory (2666 vs 2133)
Higher base frequency (2.3GHz vs 2GHz)
More modern manufacturing process (14nm vs 22nm)