The best replacement for electronica is techno.

The best alternatives to electronica are rated as following:
★★★★★  techno
★★★★★  electronic
★★★  electro
★  tigara normala
★  tigara clasica
★  firma digital
  lupe fiasco
  reggaeton
  dubstep

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Other search terms related to electronica and their ratings are:
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Google Trends

Scale is based on the average worldwide traffic of electronica in all years. Click on graph for more.
electronica
techno
electronic