I traded in my Charge for the Bionic at Costco. Don't regret it.
Charge had a nicer screen, but not visible in daylight. I also did not feel it was anywhere near as customizable as the Bionic is. I can't think of anything I haven't been able to tailor to my liking on the Bionic. It may take an app or a deeply hidden setting somewhere, but it all seems to be available, and I have not even rooted. Those options may have been there somewhere with the Charge, but they just seem to be more deeply thought out on the Bionic.
Yes, the camera is not that great, and the screen is not as impressive when you show it off to your friends indoors. But I'll take those negatives in exchange for a much more stable 4G connection, a GPS unit which actually works indoors, bluetooth which reliably reconnects with my car, speakers and vibration that I can actually detect from my pocket, a screen I can see in sunlight, tweaked battery life which outdoes the Charge, and the flexibility mentioned above.