The best replacement for pro tools 11 is logic pro x.

The best alternatives to pro tools 11 are rated as following:
★★★★★  logic pro x
★★★  cubase 7
★★★  reaper
★★★  cubase 7.5
★★★  sonar x3
★★  studio one
★★  ableton 9
★★  reason 7
★  nuendo 6
  pro tools 10
  ableton live 9
  sonar x2

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Speaking about pro tools 11, one probably shouldn't forget about digi 002.

Other search terms related to pro tools 11 and their ratings are:
★★★★★ digi 002
★★★★★ mbox
★★★★ mavericks
★★★ mbox 2
★★★ 003
★★ new mac pro
★★ digi 003
eleven rack
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pro tools 11
logic pro x
cubase 7