I5-6600K or E5-2670 V3 ES?

[AreFlame]

Which cpu should i decide to get? Both the motherboards for z170 and x99 i want to get is around 300 dollars both so i want to know which cpu i should go with?

 

[Ecky]

Engineering sample CPUs are stolen property. They frequently end up on eBay but realize that Intel does not sell them. They're early production and sometimes have unresolved bugs or run at lower frequencies or are even unstable at stock speeds.