The epics 5mp camera is better? Pretty bold statement to make with 0 facts. Considering they had multiple people making this decision.
Superior GPU for multimedia? Unless Im mistaken they didnt mention a HDMI output on the Epic, but maybe I missed that, correct me if im wrong. But looks like youre stuck with all that GPU on the 4.3 in screen, just sayin.
Having a WORKING GPS on the Evo is 1 of the main things for me. I live in a new area (for me), and I use the GPS/Nav ALOT. That alone would have me returning the Epic. (Im sure you're aware how broken Epic's GPS is atm)
Far as the call quality? Ive talked and listened to an Evo from both ends, always been flawless to me. Ive got an out of state call from an Epic, may or may not of had good signal or been roaming etc, I dont know. But he sounded to be in a hall, or echoing, not sure. However he also pref'd a physical keyboard which was the deal maker. Feel free to correct me I was wrong at any point with a link or some proof, Im only human, and deffinately make my share of mistakes. Android > all