Default CM based builds for N900

I am having few doubts regarding N9000.

N9000 is having exynos and other variants have snapdragon processor.SO why there is difference in processors for same vairant.Is snapdragon more powerful than exynos?

Also I am seeing a different thread for exynos note 3, why we are having different thread?Does it means that builds available in other treads are not meant for this device??

I am also not able to see any CM builds available for N9000 , any idea about that?