The best replacement for iron maiden is metallica.

The best alternatives to iron maiden are rated as following:
★★★★★  metallica
★★★★★  judas priest
★★★  black sabbath
★★★  megadeth
★★  ozzy
★★  acdc
★  sharon osbourne
★  slipknot
★  slayer
★  monkees
★  motorhead
★  kiss
★  ac dc
★  def leppard
★  led zeppelin
★  guns n roses
  iced earth
  avenged sevenfold
  sharon
  be dead
  ozzy osbourne
  ozzfest
  girlfriend of steel
  motley crue

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Speaking about iron maiden, one probably shouldn't forget about paul dianno.

Other search terms related to iron maiden and their ratings are:
★★★★★ paul dianno
★★★★ blaze bayley
★★ dream theater
★★ eddie
★★ paul di anno
★★ alice cooper
★ megadeth
eddie on stage
blaze bailey
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iron maiden
metallica
judas priest