The best replacement for pro4 is 4000s.

The best alternatives to pro4 are rated as following:
★★★★★  4000s
★★★★★  extreme3
★★★★  sc4x
★★★★  extreme4 z87
★★★  extreme4
★  castle 1410
★  pro3
  extreme 4

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pro4
4000s
extreme3