The best replacement for audi a4 is a6.

The best alternatives to audi a4 are rated as following:
★★★★★  a6
★★★  bmw 3 series
★★★  bmw 328i
★★★  acura tl
★★  bmw 3
★★  mercedes c300
★★  volvo s60
★  lexus is250
★  a3
★  acura tsx
★  mercedes cla
★  bmw
★  infiniti q50
★  mercedes c class
★  vw passat
★  passat
★  jetta
★  vw cc
★  infiniti g37
  lexus is 250
  bmw 328xi
  lexus is350
  bmw 325
  infiniti g35
  subaru wrx
  lexus es 350
  volkswagen passat
  volkswagen cc
  audi a6
  audi a3
  mercedes c250
  bmw 320
  mercedes c230
  bmw 335i
  3 series
  volvo s40
  bmw 320i
  bmw 3 series 2013
  bmw 328i 2014
  cla 250
  bmw 5 series
  saab 9-3

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Google Trends

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audi a4
bmw 3 series