I find PCSXR for mac lacks and has OK compatibility. I use EPSXE for windows via crossover games (well worth its purchase). I use the petes openGL2 plugin which seems so run most games just fine. PS1 games in HD is amazing.
The latest change sets of PCSX-Reloaded include a Mac port of Pete's OpenGL plugin. It still has some kinks to be worked out, but it's worth a try if you decide that you'd like to try the Mac version again.