The best replacement for r3 is microkorg.

The best alternatives to r3 are rated as following:
★★★★★  microkorg
★★★★★  s2
★★★★  r5
★★★  s3
★★★  microkorg xl
★★★  rs
★★  tarmac
★★  s5
★★  ecc
★★  soloist carbon
★★  hans
★  specialized roubaix
★  soloist
★  s2 cervelo
★  roubaix
★  caad10
★  r5 cervelo
★  trek madone
★  r4 patagonia
★  micron
★  specialized tarmac
★  supercell
  r2
  radias
  specialized tarmac sl2
  cannondale super six
  akai miniak
  r3sl
  ultranova
  alesis micron
  cervelo rs
  domane
  madone
  roland gaia
  m18x
  satria gti
  novation ultranova
  supersix
  airframe
  mysap

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Google Trends

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