The best replacement for simple plan is green day.

The best alternatives to simple plan are rated as following:
★★★★★  green day
★★★★  sum 41
★★★★  good charlotte
★★★  sep ira
★★  blink 182
★★  all time low
★★  yellowcard
★  kotak
  sep plan
  fargo

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Speaking about simple plan, one probably shouldn't forget about good charlotte.

Other search terms related to simple plan and their ratings are:
★★★★★ good charlotte
★★★ avril lavigne
★ avril
★ green day
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Google Trends

Scale is based on the average worldwide traffic of simple plan in all years. Click on graph for more.
simple plan
green day
sum 41