Here is a comparison between Samsung Galaxy S2 and Motorola Droid Bionic.
Samsung Galaxy S2 sports a 4.3-inch (4.52 for the Sprint Epic 4G Touch and T-Mobile USA's Galaxy S2) Super AMOLED screen with 800x480 screen resolution. The 4.3-inch screen comes with 217 ppi pixel density, while the 4.52-inch screen comes with 206 ppi. Motorola Droid Bionic has a 4.3-inch qHD screen that should give a resolution of 960x540-pixel at 256 ppi pixel density.
Galaxy S2 is powered by a dual-core 1.2GHz ARM Cortex-A9 processor, a Mali-400MP GPU and an Exynos chipset. Motorola Droid Bionic comes with a dual-core 1GHz ARM Cortex-A9 processor, ULP GeForce GPU and Tegra 2 AP20H chipset.
Galaxy S2 has an 8 megapixel rear-facing camera, with 3264×2448 pixels, autofocus and single LED flash and a 2 megapixel front-facing camera for video calling. Motorola Droid Bionic also sports an 8 megapixel autofocus camera with 3264×2448 pixels, autofocus and dual LED flash, as well as a front-facing camera for video chats.
Both the Motorola Droid Bionic and the Samsung Galaxy S2 run on the Android 2.3.4 Gingerbread OS. Samsung Galaxy S2 is an HSPA+ ready phone with 21Mbps download speed and 5.76Mbps upload. Motorola Droid Bionic has Rev. A, up to 3.1 Mbps, LTE.
Motorola Droid Bionic has 16GB internal storage and another 16GB microSD card preinstalled, which can be expanded to 32 GB. Galaxy S2 boasts 16GB internal storage, expandable up to 32GB via a microSD card. Both phones have 1GB RAM.
Motorola Droid Bionic, weighing 158.8g, has a standard 1735 mAh battery offering talk time of 650 minutes and standby time of 200 hours. Samsung Galaxy S2 features a Li-Ion 1650 mAh battery offering talk time up to 540 minutes and standby up to 576 hours on 3G. It weighs 116g.