The best replacement for brush cutter is line trimmer.

The best alternatives to brush cutter are rated as following:
★★★★★  line trimmer
★★★★★  trimmer
★★  string trimmer
★★  clearing saw
★★  whipper snipper
★  stihl
★  strimmer
★  line trimmers
★  lawn mower
  grass trimmer

Your alternative for brush cutter is not listed? Suggest!
Speaking about brush cutter, one probably shouldn't forget about trimmer.

Other search terms related to brush cutter and their ratings are:
★★★★★ trimmer
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brush cutter
line trimmer
trimmer