It's PhoneDog dogfight time!  Aaron throws the Apple iPhone 4 and the Samsung Galaxy S 4G into the ring.  The iPhone 4, now available on AT&T and Verizon, offers Apple's A4 processor, a 3.5-inch Retina Display, 5-megapixel camera, and a front-facing camera for video calling.  T-Mobile's Samsung Galaxy S 4G is an evolutionary upgrade from the Vibrant and is powered by a 1 GHz Hummingbird processor, 4-inch Super AMOLED display, 5-megapixel camera, front-facing camera, Android 2.2 with Samsung's TouchWiz UI, and a larger 1,650 mAh battery.

They're both good devices in certain areas, but only one can be the winner.  Will it be the media-centric iPhone 4, or the Google-toting Galaxy S 4G?  Tune in to find out!  Part 1 of 2.