The best replacement for emp is nuke.

The best alternatives to emp are rated as following:
★★★★★  nuke
★★★  aegis
★★★  p938
★★  fusion lance
★★  cme
★★  cdp
★★  plasma cannon
★★  plasma cannon xcom
★★  faraday cage
★  kimber ultra carry
★  colt defender
★  kimber aegis ii
★  solar panel
★  micro compact
★  ultra carry
★  kimber cdp
★  electromagnetic pulse
★  kimber solo
  moab
  emp
  ultra compact
  xdm compact
  kimber cdp ii
  springfield ultra compact
  ultra cdp
  tactical nuke

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Speaking about emp, one probably shouldn't forget about nuke.

Other search terms related to emp and their ratings are:
★★★★★ nuke
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Google Trends

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emp
nuke
aegis