The best replacement for aosp is touchwiz.

The best alternatives to aosp are rated as following:
★★★★★  touchwiz
★★★★★  sense
★★★★  cm
★★★★  aokp
★★★★  cyanogenmod
★★  tw
★★  caf
★★  gpe
★★  google keyboard
★  gms
★  cm10
★  touchwiz camera
★  touchwiz note 2
  google edition
  google android
  cyanogen
  aopk

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Google Trends

Scale is based on the average worldwide traffic of aosp in all years. Click on graph for more.
aosp
touchwiz
sense