Wich should i choose ?

Solution
4690k - dead socket, no further upgrade path.

6600k - new socket, DDR4 support, probable upgrade path to Kaby Lake, plus support for other newer tech.

Intel hasn't had any real leaps in performance in a while now, so kind of have to look at the feature set, potential upgrade path and for the "k" series, overclockability. Which IIRC, they are pretty decent.
4690k - dead socket, no further upgrade path.

6600k - new socket, DDR4 support, probable upgrade path to Kaby Lake, plus support for other newer tech.

Intel hasn't had any real leaps in performance in a while now, so kind of have to look at the feature set, potential upgrade path and for the "k" series, overclockability. Which IIRC, they are pretty decent.
 
Solution