The best replacement for apc20 is apc40.

The best alternatives to apc20 are rated as following:
★★★★★  apc40
★★★★  launchpad
★★  mpd26
★  novation launchpad
★  apc40 akai
  apc 40

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Speaking about apc20, one probably shouldn't forget about apc40.

Other search terms related to apc20 and their ratings are:
★★★★★ apc40
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