Which barrier would be more soundproof?

Hi, I´m considering two options in order to isolate CR from the noise generated in the LV. Both of them are based on the Two leaf principle: Option 1: 15 cm Brickwall 15 cm airgap (leaf to leaf) 2x6 wood studs (filled with insulation) 3 layers of 5/8 drywall (this is 5cm of drywall) Option 2: 15 cm brickwall 5 cm airgap (filled with insulation) 15 cm brickwall In general terms, which is these two options would be better at soundproofing in general terms. Based on what I have read, the second option would be better because it has more mass but the airspace is less.

Try them out with my calculator: viewtopic.php?f=1&t=21770 Greg