The best replacement for chainsaw is pig.

The best alternatives to chainsaw are rated as following:
★★★★★  pig
★★★★  axe
★★★  gas chainsaw
★★  chainsaw
★★  stihl
★★  stihl chainsaw
★★  pole saw
★★  hand saw
★★  lsat
★  reciprocating saw
★  husqvarna
★  husqvarna chainsaw
★  machete
★  katana killing floor
★  circular saw
★  hedge trimmer
★  chain saw
  echo
  hedge trimmers
  echo chainsaw
  logfactor5
  samurai sword
  hammerburst
  electric chainsaw

Your alternative for chainsaw is not listed? Suggest!
Speaking about chainsaw, one probably shouldn't forget about extension pole.

Other search terms related to chainsaw and their ratings are:
★★★★★ extension pole
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Google Trends

Scale is based on the average worldwide traffic of chainsaw in all years. Click on graph for more.
chainsaw
pig
axe