The best replacement for atx is micro atx.

The best alternatives to atx are rated as following:
★★★★★  micro atx
★★★★  btx
★★★  atx12v
★★★  itx
★★  eatx
★★  matx
★★  mini atx
★★  mini itx
★  at
★  uatx
★  micro atx motherboard
★  extended atx
★  atx
★  btx difference
★  micro atx power supply
★  micro atx case
  btx motherboard
  eps
  btx power supply
  mid atx
  micro atx difference
  itx for gaming
  taxwise
  micro
  lacerte
  xl atx
  nlx
  drake
  sfx
  atx which is better
  proseries
  minelab 5000
  at power supply
  eps power supply
  micro atx psu
  matx case
  atx case
  motherboard
  atx motherboard
  mtx
  e-atx

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Google Trends

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atx
micro atx
btx