The best replacement for logic pro 9 is pro tools 9.

The best alternatives to logic pro 9 are rated as following:
★★★★★  pro tools 9
★★★★  logic pro x
★★★  pro tools 10
★★★  logic studio
★★  ableton live 9
★★  pro tools 8
★★  garageband
★★  cubase
★★  cubase 5
★★  logic express 9
★★  logic pro 8
★★  ableton live 8
★★  ableton
★  cubase 7
★  garageband 11
★  ableton live
★  reason 6
  logic studio 9
  reason 6.5

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Speaking about logic pro 9, one probably shouldn't forget about os x mavericks.

Other search terms related to logic pro 9 and their ratings are:
★★★★★ os x mavericks
★★★ digi 003
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logic pro 9
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