The best replacement for kerdi is ditra.

The best alternatives to kerdi are rated as following:
★★★★★  ditra
★★★★★  wedi
★★★★★  redguard
★★★  cement board
★★  tile redi
★★  hydro ban
★★  nobleseal
★★  noble
★★  durock
★  laticrete
★  hardibacker
★  wedi board
★  tileredi
★  hydroban
★  aqua shield
★  prova
  provamat
  hot mop
  homelux
  redgard
  aquashield
  densshield

Your alternative for kerdi is not listed? Suggest!
Speaking about kerdi, one probably shouldn't forget about modified thinset.

Other search terms related to kerdi and their ratings are:
★★★★★ modified thinset
★★★★ versabond
★★ mud pan
★ quick pitch
★ hardibacker
ditra
You have in mind a companion for kerdi and it is not yet here? Propose!



Google Trends

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kerdi
ditra
wedi