The best replacement for ps1 is n64.

The best alternatives to ps1 are rated as following:
★★★★★  n64
★★★★★  ps2
★★★  psx
★★  dreamcast
★  psp
★  saturn
★  xbox 1
★  ps2 controller
★  n64 sales
★  n64 specs
  n64 graphics
  psone
  nintendo 64
  ps11
  mulberry alexa
  alexa
  gamecube

Your alternative for ps1 is not listed? Suggest!
Speaking about ps1, one probably shouldn't forget about ps2 controller.

Other search terms related to ps1 and their ratings are:
★★★★★ ps2 controller
You have in mind a companion for ps1 and it is not yet here? Propose!



Google Trends

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ps1
n64
ps2