never tried kings kush, but GRAPE APE is my all time fav indica at the moment....
on the other hand chemdawg is the original mother to OG Kush and Sour Diesel....
but (this is my opinion) if I were you I would deal with another seed company
never grew green house seeds gear, but I've heard of alot of their seed going hermie / unstable genetics
But out of the 2 I would go with the Kings Kush