The best replacement for rotozip is dremel.

The best alternatives to rotozip are rated as following:
★★★★★  dremel
★★★  jigsaw
★★  dremel saw max
★  dremel trio
★  dremel tool
★  angle grinder
★  versacut
★  rockwell versacut
★  fein multimaster
★  trim router
  dremel 4000
  dewalt dw660
  sonic crafter
  dual saw

Your alternative for rotozip is not listed? Suggest!
Speaking about rotozip, one probably shouldn't forget about router bits.

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



Google Trends

Scale is based on the average worldwide traffic of rotozip in all years. Click on graph for more.
rotozip
dremel
jigsaw