The best replacement for mytouch 4g is g2.

The best alternatives to mytouch 4g are rated as following:
★★★★★  g2
★★★★  nexus s
★★  mytouch 4g slide
★★  evo
★★  vibrant
★  hd7
★  htc sensation
★  htc hd7
★  mytouch q
★  samsung vibrant
★  galaxy s
★  g2x
★  samsung galaxy s
  htc amaze
  galaxy s 4g
  nexus one
  iphone 4g
  lg optimus l9
  evo 4g
  htc evo
  lg mytouch
  htc radar
  htc mytouch 4g
  samsung exhibit
  google g2
  tmobile g2
  samsung galaxy blaze

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Google Trends

Scale is based on the average worldwide traffic of mytouch 4g in all years. Click on graph for more.
mytouch 4g
nexus s