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why common emitter configuration is most widely used as an amplifier

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because it has suitable bandwidth and gain. other configurations only have bandwidth or gain, but common emitter has both of them.
 

Another important property if compared with common base: Much higher input resistance.
 

  • Common base amplifier: Useful voltage gain, but no current gain.
  • Common collector amplifier: Useful current gain, but no voltage gain.
  • Common emitter amplifier: Useful voltage gain and useful current gain.
 

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