The best replacement for quietrock is green glue.

The best alternatives to quietrock are rated as following:
★★★★★  green glue
★★  double drywall
★  resilient channel
★  sheetrock
★  suppress
★  mass loaded vinyl
★  soundboard
  silentfx

Your alternative for quietrock is not listed? Suggest!
Speaking about quietrock, one probably shouldn't forget about green glue.

Other search terms related to quietrock and their ratings are:
★★★★★ green glue
★★★ resilient channel
You have in mind a companion for quietrock and it is not yet here? Propose!



Google Trends

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quietrock
green glue
double drywall