Both phones have bar shaped design with Nexus S having curved edges and Optimus Black with edges not as curved as Nexus S. Optimus Black weighs only 109g and only 9.2mm thick. Nexus S is on the thicker side with thickness of 10.9mm and also quiet heavier weighing 129g. Optimus Black being much lighter and thinner is ahead in this little contest.
Optimus Black features the new IPS LCD capacitive gorilla glassed touchscreen which surely is better than then other LCD panels around but not as good as Super AMOLED TFT capacitive touchscreen of Nexus S. The display is actually a curved glass display which Samsung calls the “contour display” and claims it to feel more pleasant against the face. The screen size of both the phones is 4.0 inches with 16M colors and resolution of 480 x 800 pixels. Nexus S with its super AMOLED takes the lead on the display front.
Processor and OS:
Nexus S features 1 GHz ARM Cortex-A8 processor powered by PowerVR GPU and Hummingbird chipset. Optimus Black also has the same 1 GHz processor and GPU with TI OMP chipset. Nexus S features the latest Android 2.3(Gingerbread) and Optimus Black comes with Android 2.2 which upgradeable to Android 2.3. Both devices have the same processing power and OS, so no one has the advantage here.
Both the smart phones feature a 5MP camera with autofocus and LED flash. Optimus black has the slight advantage though; it is able to record HD 720p video at 30fps unlike Nexus S which record WVGA video at 30fps. Optimus Black also has a 2MP secondary camera much better than secondary VGA camera in Nexus S.
Nexus S provides huge 16GB of internal storage and 512MB of RAM to go with it. Optimus S has internal storage capacity of 2GB with same 512MB of RAM. External storage can be up to 32GB via SD memory card. Nexus S with greater internal storage capacity is slightly ahead on this front.