The best replacement for slipknot is mushroomhead.

The best alternatives to slipknot are rated as following:
★★★★★  mushroomhead
★★★★★  korn
★★★★  stone sour
★★★  linkin park
★★★  icp
★★★  justin bieber
★★★  bieber
★★  green day
★★  mudvayne
★★  tool
★★  system of a down
★★  limp bizkit
★★  hollywood undead
★★  metallica
★  joey jordison
★  iron maiden
★  gwar
★  deftones
★  justin
★  disturbed
★  dream theater
★  a7x
★  jonas brothers
★  rammstein
  slayer
  pantera
  fred durst
  insane clown posse
  cliff richard
  lamb of god

Your alternative for slipknot is not listed? Suggest!
Speaking about slipknot, one probably shouldn't forget about metallica.

Other search terms related to slipknot and their ratings are:
★★★★★ metallica
★★★ paul gray
★★ corey taylor
★ rope
coheed and cambria
korn
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Google Trends

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slipknot
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