Man long debate on this one. I say use whatever you feel works. There are some that state AAC are far cooler(Data supports this) but they cost more and with some forward thinking like longer eaves, attic ventilation and large trees its a no issue. Of course if you build a 2 story McMansion and have no wall protection heat is a huge issue so AAC blocks would help.. I will say this. before we built I took a few AAC blocks and a few red blocks and drilled them. The ACC blocks turned into dust (Like a big dried sponge)and when you sink an insert to hang a picture or a wall mount TV bracket they can easily pull out. I would NEVER do it if I had AAC blocks. IMHO red blocks are far better. Others may argue the point.

Save money, Use Red Brick.