Here i found some facts that might help you,
"Droid Bionic: The powerful smartphone Droid Bionic comes with 1GHz dual-core processor,8-megapixel camera with HD video capture, and video calling via front-facing camera. Other features include mobile Wi-Fi hotspot, HDMI TV-out, DLNA wireless media streaming, 3.5mm audio jack, and a memory card slot.
The price of Motorola Droid Bionic is set for $149.99.
Samsung Droid Charge: Another smartphone from Verizon network Droid Charge comes with a large 4.3-inch touch screen, 8-megapixel camera with HD video capture, video calling via front-facing camera, and 1 GHz Hummingbird processor. Other features include mobile Wi-Fi hotspot, HDMI TV-out, DLNA wireless media streaming, 3.5mm audio jack, and a memory card slot.
Samsung Droid Charge will cost you $299.99 and you can buy it from Amazon."
I like the bionic, personally they both seem like great phones and they are both very similar but the dual core seems more appealing to me
