ePSXe if you want performance quality, kasi p'wede n'yang idaan sa hardware 'yung emulation, i.e., kung maganda graphics card mo, p'wede gumanda visual quality.
pSX if you want compatibility, kasi hindi naman 100% ng games gagana or magrurun ng maayos sa ePSXe. Pero hindi maganda quality ng emulation kasi it tries to emulate the PSX verbatim.
![Grin ;D](http://talk.philmusic.com/Smileys/default/big_smile.png)