I've been a BB user for the last couple years, but have decided to go Android when my upgrade goes active on October 1st. I had my choices narrowed to the Evo and Epic, and since the Epic was released today, I decided to hit the Sprint Store and check them out side by side. My opinions are below.
Screen: I didn't think 4" would be all that different from 4.3", I was wrong. While the screen is noticeably smaller, but the Epic's screen is so much sharper. The colors really pop on the Epic. When holding one in each hand, the Evo seems a little faded.
Camera: After snapping a couple shots with the Epic, and checking out the camera mode on the Evo, its easy to see the lower MP camera on the Epic is far and away better.
Keyboard: I prefer a physical keyboard, so obviously that draws me to the Epic. Its a comfortable keyboard with nice, easy to push buttons. I tried the virtual keyboard on both, and while its a little bigger on the Evo, I actually preferred the virtual keyboard on the Epic.
Speed: I admit, I know next to nothing about this kind of stuff. The Epic seemed faster.
Feel: Both felt pretty good in my hand. The slider on the Epic was better than I thought it would be, and doesn't seem like a toy.
All told, come October 1, I'll be rocking an Epic. Hopefully Froyo has been released for it by then.