The best replacement for chisel is semi chisel chain.

The best alternatives to chisel are rated as following:
★★★★★  semi chisel chain
★★★★  axe
★★★  semi chisel
★★★  hammer
★★  chisel
★  wood chisel
★  osteotome
★  gouge
★  full chisel chain
★  moldboard
★  v grind
  square chisel
  full chisel
  full chisel chains

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Speaking about chisel, one probably shouldn't forget about rotary hammer.

Other search terms related to chisel and their ratings are:
★★★★★ rotary hammer
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chisel
semi chisel chain
axe