I'm an Epic owner (had the EVO) and honestly I can say that the Epic is superior in almost all hardware aspects, screen, cpu, camera, accelerometer (6 axel) etc. But what I'm starting to not like about it is the stock/like android experience it offers (except the launcher) versus what SenseUI offers. Sense is like a whole new android experience fom the launcher with its widgets to all the core apps, it screams high end like no other Android device can match IMHO and my Epic feels so bland after owning a Sense device (or maybe I just dnt like stock Android)

Anyway, I'm considering swapping the Epic back to thev EVO. But that's just me.

Conclusion:

Epic = hardware
EVO = software

Whichever you prioritize when looking for a powerful device