The best replacement for presonus is focusrite.

The best alternatives to presonus are rated as following:
★★★★★  focusrite
★★★  motu
★★★  m-audio
★★  soundcraft
★★  m audio
★★  mackie
★★  behringer x32
★  tascam
★  krk
★  scarlett
★  behringer
★  mackie onyx
★  apogee
★  focusrite preamp
★  x32
★  rme
★  allen heath
  allen and heath
  mbox
  focusrite scarlett
  digidesign
  lexicon

Your alternative for presonus is not listed? Suggest!
Speaking about presonus, one probably shouldn't forget about smaart.

Other search terms related to presonus and their ratings are:
★★★★★ smaart
★★★★ digital snake
★★★ protools
You have in mind a companion for presonus and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of presonus in all years. Click on graph for more.
presonus
focusrite
motu