The best replacement for durock is hardibacker.

The best alternatives to durock are rated as following:
★★★★★  hardibacker
★★★★  wonderboard
★★★  permabase
★★  cement board
★★  hardie
★★  fiberock
★★  densshield
★★  ditra
★  green board
★  hardiboard
★  hardi
★  greenboard
★  denshield
  backer board
  kerdi
  hardy board
  backerboard
  hardibacker better
  hardie board
  hardi board

Your alternative for durock is not listed? Suggest!
Speaking about durock, one probably shouldn't forget about vapor barrier.

Other search terms related to durock and their ratings are:
★★★★★ vapor barrier
You have in mind a companion for durock and it is not yet here? Propose!



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durock
hardibacker
wonderboard