The best replacement for moto x is iphone 5s.

The best alternatives to moto x are rated as following:
★★★★★  iphone 5s
★★★★★  htc one
★★★★  nexus 5
★★★★  galaxy s4
★★★★  droid maxx
★★★  moto g
★★★  lg g2
★★★  iphone 5c
★★  droid ultra
★★  iphone
★★  droid mini
★★  galaxy s3
★★  samsung galaxy s4
★  iphone 4s
★  nexus 4
★  note 3
★  g2
★  samsung s4
  iphone 4
  galaxy s5
  note 2
  google nexus 5
  samsung galaxy 3
  galaxy nexus
  galaxy s4 mini
  galaxy 4
  iphone 5
  samsung galaxy 4
  s4 mini
  razr maxx
  htc one mini

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Google Trends

Scale is based on the average worldwide traffic of moto x in all years. Click on graph for more.
moto x
iphone 5s
htc one