The best replacement for rebreather is scuba.

The best alternatives to rebreather are rated as following:
★★★★★  scuba
★★★★  open circuit
★★★  venturi mask
★★  partial rebreather
★★  nitrox
★★  simple mask
★★  non rebreather mask
★★  rebreather
★★  nasal cannula
★  bvm
★  bipap
★  bag valve mask
★  non rebreather
★  inspiration
  venturi
  ventimask
  nonrebreather
  pocket mask
  facemask
  partial rebreather mask

Your alternative for rebreather is not listed? Suggest!
Speaking about rebreather, one probably shouldn't forget about full face mask.

Other search terms related to rebreather and their ratings are:
★★★★★ full face mask
★★★ trimix
You have in mind a companion for rebreather and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of rebreather in all years. Click on graph for more.
rebreather
scuba
open circuit