Normally, people use
Autoclaved Aerated Concrete (AAC) to build a concrete house because ACC is a good thermal insulation brick that easy to buy and not expensive
And another way i've heard about insulation wall is
Cavity wall. IMO, it rarely find a house that use this kind of wall.
Then the main topic of discussion here might be
Autoclaved Aerated Concrete (AAC) wall vs
Cavity wall which one is the best thermal insulation wall?
Note that another method can be purpose if it better than
ACC wall and