The best replacement for ax pro is ax720.

The best alternatives to ax pro are rated as following:
★★★★★  ax720
★★★★★  a40
★★★★  x41
★★★★  720
★★★  astro a40
★★★  px5
★★★  turtle beach x41
★★  dpx21
★★  ax 720
★★  turtle beach dpx21
★  turtle beach xp500
★  ax720 tritton
★  astro a50
★  astro
★  sharkoon x-tatic
★  turtle beach x42
★  a30
  ax51 pro
  tritton ax 720
  turtle beach px5
  astro a30
  dx11
  astro a 40

Your alternative for ax pro is not listed? Suggest!
Speaking about ax pro, one probably shouldn't forget about astro mixamp.

Other search terms related to ax pro and their ratings are:
★★★★★ astro mixamp
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ax pro
ax720
a40