The best replacement for b20b is b20z.


The best alternatives to b20b are rated as following:
★★★★★  b20z
★★★★  b18b
★★  b18c
★★  b18b1
★  b18a1
★  b16a
★  h22a
  d15b
  b16a2
  b20z2
  b20a
  b20b4
  b20b
  b16b

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b20b
b20z
b18b