There has never been so fierce a rivalry between smartphones, with a number of devices readily available from leading manufacturers like Samsung, Apple and Motorola. As of now, there are three smartphones vying to be described as the best and attract the customers they feel they deserve.

Recently announced by Apple, the iPhone 4S will be launched within the next two weeks, while Samsung launched its Galaxy S2 in U.S. markets sometime in the middle of September. The Motorola Droid Bionic was also released around the same time. Here is a comparison of the three phones - on the basis of specs, features and price.

Display: The iPhone 4S will have a 3.5-inch TFT Retina multi-touch display, with 960x640 resolutions at 330 ppi pixel density. The 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. The Motorola Droid Bionic has a 4.3-inch qHD screen that should give a resolution of 960x540-pixel at 256 ppi pixel density.

Processor: While the Galaxy S2 is powered by a dual-core 1.2GHz ARM Cortex-A9 processor, a Mali-400MP GPU and an Exynos chipset, the Motorola Droid Bionic comes with a dual-core 1GHz ARM Cortex-A9 processor, ULP GeForce GPU and Tegra 2 AP20H chipset. On the other hand, the iPhone 4S features 1 GHz dual-core ARM Cortex-A9 processor, PowerVR SGX543MP2 GPU and an Apple A5 chipset.

Camera: The 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. The Motorola Droid Bionic also sports an 8 megapixel auto-focus camera with 3264×2448 pixels, autofocus and dual LED flash, as well as a front-facing camera for video chats. Not to be outdone, the iPhone 4S also comes with an 8 megapixel, 3264×2448 pixels, autofocus, LED flash camera in the front. It features a VGA front-facing camera. The cameras of all three phones can shoot HD videos of up to 1080p.

Operating System: Both the Motorola Droid Bionic and the Samsung Galaxy S2 run on the Android 2.3.4 Gingerbread OS. The iPhone 4S is loaded with the latest Apple operating system iOS 5 - a free software update bringing over 200 new features to the iPhone, the iPad and the iPod touch, including wireless syncing, Twitter integration and widgets.

Data Speed: With high-speed download packet access (HSDPA) technology, the iPhone 4S is claimed to have data download speed that is nearly twice as fast as iPhone 4 -- 14.4Mbps compared with 7.2Mbps. It supports 5.8Mbps upload speed. The Samsung Galaxy S2 is an HSPA+ ready phone with 21Mbps download speed and 5.76Mbps upload. The Motorola Droid Bionic has Rev. A, up to 3.1 Mbps, LTE.

Storage: The Motorola Droid Bionic has 16GB internal storage and another 16GB microSD card preinstalled, which can be expanded to 32 GB. The Galaxy S2 boasts 16GB internal storage, expandable up to 32GB via a microSD card. Both phones have 1GB RAM. The iPhone 4S comes in 16GB, 32GB and 64GB models. It doesn't support a MicroSD card slot. Apple has not revealed the RAM capabilities of the iPhone 4S.

Battery Life: Weighing in at 140g, the iPhone 4S has a Li-Po 1,420 mAh battery, with 8 hours of talk time on 3G and up to 14 hours on 2G networks (GSM). The Motorola Droid Bionic, weighing 158.8g, has a standard 1735 mAh battery offering talk time of 650 minutes and standby time of 200 hours. The 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.

Price: The iPhone 4S costs $199 for the 16GB model, $299 for the 32GB model and $399 for the 64GB model. The Motorola Droid Bionic is priced at $299 with a two-year contract from Verizon. On Sprint's networks, the Epic 4G Touch will cost $199.99 with a two-year contract. The AT&T version is expected to be in the range of $250 to $300, while T-Mobile is yet to announce pricing or availability details.

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