The best replacement for a3 is a4.

The best alternatives to a3 are rated as following:
★★★★★  a4
★★★★★  gti
★★★  golf
★★★  a4 upper
★★  a4 audi
★★  cla
★★  a4 paper
★  m4
★  vw gti
★  a2
★  cla 250
★  a3+
★  11x17
★  a4 bigger
★  1 series
  a3os
  q3
  tabloid
  jetta
  8d
  bmw 1 series
  sportwagen
  audi a4
  2 series
  a4 upper receiver
  a4 ar 15
  a4 avant
  a3 sportback
  a4 paper size
  a4 printer
  320i
  volkswagen gti
  jetta wagon
  e601i-a3e
  golf tdi
  r32
  golf gti
  volvo c30
  vw golf
  a30
  gti 2013
  shox
  mercedes cla
  pdca
  a3 os
  c30
  mini countryman
  hd a2
  a0
  bmw series 1

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Google Trends

Scale is based on the average worldwide traffic of a3 in all years. Click on graph for more.
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