The best replacement for s3 is s4.

The best alternatives to s3 are rated as following:
★★★★★  s4
★★★  s5
★★★  iphone 5
★★  iphone 4s
★★  note 2
★★  s3 mini
★★  nexus 5
★★  ebs
★  s4 mini
★  note 3
★  ec2
★  s4 specs
★  sony h5
★  moto x
★  s2
★  iphone
★  s1
★  moto g
★  r32
★  htc one
★  4s
★  h5
  galaxy note
  glacier
  note
  s4 active
  galaxy s4
  golf r32
  cloudfront
  5s
  5c
  rackspace
  iphone 5c
  grand 2
  s1 sleep
  htc one x
  dropbox
  r3
  fz8
  s86
  galaxy s2
  xperia z
  galaxy note 2
  honda civic type r
  135i
  golf r
  nexus 4
  ga 965p ds3
  130i
  sony h2
  v7
  htc evo 4g lte
  canon s5
  samsung galaxy s4
  135
  a710
  samsung galaxy s2
  iphone 4
  samsung s4
  s4 better
  samsung galaxy note 2
  azure
  canon s2
  ds3
  s3n
  s4 battery life
  felt ar1
  razr maxx
  htc one s

Your alternative for s3 is not listed? Suggest!
Speaking about s3, one probably shouldn't forget about cloudfront.

Other search terms related to s3 and their ratings are:
★★★★★ cloudfront
★★★ galaxy gear
★★★ heroku
★★ ec2
★ gear
★ android 4.3
jelly bean
You have in mind a companion for s3 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of s3 in all years. Click on graph for more.
s3
s4
s5