The best replacement for s4 active is s4.

The best alternatives to s4 active are rated as following:
★★★★★  s4
★★★★  s3
★★★  note 2
★★★  s4 zoom
★  xperia z
★  s4 mini
★  samsung galaxy s4
★  galaxy s4
★  z1
  samsung s4
  rugby pro
  xperia zr

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s4 active