The best replacement for droid 4 is droid razr.

The best alternatives to droid 4 are rated as following:
★★★★★  droid razr
★★★★  droid razr m
★★★  droid bionic
★★★  razr maxx
★★★  droid 3
★★  samsung stratosphere
★  droid mini
★  photon q
★  lg enact
★  razr
★  galaxy nexus
★  droid x2
★  htc rezound
★  droid 2
  droid 2 global
  razr m
  droid razr maxx
  galaxy stratosphere ii
  droid razor
  droid pro

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droid 4
droid razr
droid razr m