The best replacement for a20 is zulu 2.

The best alternatives to a20 are rated as following:
★★★★★  zulu 2
★★★★★  t50
★★★★  a23
★★★  a9
★★★  a600
★★★  a13
★★★  a900
★★  zulu
★★  a22
★★  a10
★★  a2
★★  rk3066
★★  a500
★  a31s
★  sennheiser s1
★  a30
★  lightspeed zulu
★  clarity aloft
★  pfx
★  rk3168
★  hd xa2
★  hd a30
★  zulu headsets
★  a31
★  lightspeed zulu 2
  xa2
  hd a2
  g9
  zulu pfx
  bose x
  a700
  220
  zulu2

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Google Trends

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a20
zulu 2
t50