The best replacement for b18 is b20.

The best alternatives to b18 are rated as following:
★★★★★  b20
★★★★★  b16
★★★★★  h22
★★★★  k20
★★★  d16
★★  k24
★  b20 vtec
★  b20 block
★  d16z6
★  d16 turbo
★  h22 swap
★  b20 head
★  b16 turbo
★  h22a
★  r18
★  h22 weight
★  b16 transmission
  4g63
  b20 engine
  b20 better
  b16 faster
  h23
  b18
  2zz
  b16b
  b16 head
  3sge
  h22 motor
  b21

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Speaking about b18, one probably shouldn't forget about b20.

Other search terms related to b18 and their ratings are:
★★★★★ b20
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Google Trends

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