The best replacement for petrucci is malmsteen.

The best alternatives to petrucci are rated as following:
★★★★★  malmsteen
★★★★  satriani
★★★★  vai
★★★  gilbert
★★★  buckethead
★★  steve vai
★★  dimebag
★★  gilmour
★★  yngwie malmsteen
★  mustaine
★  alexi laiho
★  slash
★  joe satriani
★  paul gilbert
★  hammett
★  eddie van halen
  kirk hammett
  synyster gates
  batio
  michael romeo
  alexis laiho
  dimebag darrell

Your alternative for petrucci is not listed? Suggest!
Speaking about petrucci, one probably shouldn't forget about g3.

Other search terms related to petrucci and their ratings are:
★★★★★ g3
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Google Trends

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petrucci
malmsteen
satriani