Your best bet is to build the structure as rigid as possible at the most cost effective way and put the money into proper room treatment.
A conventional room with flat ceiling can be properly acoustically modeled which when built with the right dimensions can be modeled to have the fewest and most benign null points in the room, then with the right types and placement of treatments you can get a good sounding room.
A conventional room with flat ceiling can be properly acoustically modeled which when built with the right dimensions can be modeled to have the fewest and most benign null points in the room, then with the right types and placement of treatments you can get a good sounding room.