The best replacement for e27 is e26.

The best alternatives to e27 are rated as following:
★★★★★  e26
★★★  e26 base
★★★  e14
★★★  a19
★★★  e26 bulb
★★  gu10
★★  par20
★  medium base
★  mr16
★  e26 light bulb
  a21
  b22

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e27
e26
e26 base