The best replacement for jack hammer is baki.

The best alternatives to jack hammer are rated as following:
★★★★★  baki
★★★★  rotary hammer
★★★  hammer drill
★★  concrete saw
★  demolition hammer
★  brenn wyson
  chipping hammer
  electric jack hammer
  air jack hammer

Your alternative for jack hammer is not listed? Suggest!
Speaking about jack hammer, one probably shouldn't forget about excavator.

Other search terms related to jack hammer and their ratings are:
★★★★★ excavator
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jack hammer
baki
rotary hammer