Well, if I get it right, Shapeshifer isn't really an emulator but some kind of compatibility layer to allow OS-friendly Mac programs to run on Amiga, so it might be actually be better than other options

I can't wait to have the new FPGA Arcade core to install Mac OS on it

(Not that I like Mac OS better! But it has some decent non-amiga games like Alone In The Dark or Wolfenstein 3D).