The best replacement for a4 is letter.

The best alternatives to a4 are rated as following:
★★★★★  letter
★★★★  a5
★★★★  a6
★★★  s4
★★  3 series
★★  a3
★  328i
★  gti
★  m4
★  bmw 3 series
★  wrx
★  a5 audi
★  bmw 3
★  g37
★  a2 upper
★  passat
★  328
★  jetta
★  letter size
  a6 audi
  a3 paper
  a5 paper size
  letter paper
  8.5x11
  q5
  us letter
  bmw
  acura tl
  bmw 328i
  mercedes c300
  320i
  a6 amd
  a3 paper size
  snapdragon
  legal
  intel i3
  tl
  g35
  foolscap
  is250
  c250
  acura tsx
  a6 processor
  bmw 325
  bmw 328xi
  audi a3
  a5 processor
  c300
  lexus es 350
  tsx
  328xi
  vw passat
  a3 audi
  a5 chip
  m6
  335
  mercedes c class
  a5 bigger
  audi a6
  lexus is250
  tt
  s4 audi
  q50
  325
  volvo s60

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Google Trends

Scale is based on the average worldwide traffic of a4 in all years. Click on graph for more.
a4
letter
a5