The best replacement for jackhammer is concrete saw.

The best alternatives to jackhammer are rated as following:
★★★★★  concrete saw
★★★  shredmaster
★★  shredder
★  jackhammer
★  solo x
  sledgehammer
  mtx thunder

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

Other search terms related to jackhammer and their ratings are:
★★★★★ compressor
You have in mind a companion for jackhammer and it is not yet here? Propose!



Google Trends

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jackhammer
concrete saw
shredmaster