The best replacement for inline 4 is v4.

The best alternatives to inline 4 are rated as following:
★★★★★  v4
★★★★★  v6
★★★★  v twin
★★★  flat 4
★★★  inline 6
★★  parallel twin
★  boxer 4
★  v4 motorcycle
★  v-twin
★  triple
★  v6 engine
★  twin
  single cylinder
  boxer engine
  inline 5
  l twin
  v 4
  vtwin

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Google Trends

Scale is based on the average worldwide traffic of inline 4 in all years. Click on graph for more.
inline 4
v4
v6