T-Mobile's myTouch 4G takes advantage of T-Mobile's speedy HSPA+ network to achieve faster download and browsing speeds. With a front-facing camera and HTC Sense, the myTouch 4G is definitely T-Mobile's top-of-the-line phone. If you don't like typing on a touchscreen, consider the HTC G2--another phone that takes advantage of T-Mobile's HSPA+ network, but one that has a QWERTY keyboard.
Though the Google Nexus One ranks higher, it is no longer available for purchase. But the Samsung Vibrant is a great multimedia device and comes equipped with a beautiful Super AMOLED. This featherlight phone comes preloaded with James Cameron's Avatar to show off its screen's display capabilities. If you're dead set on getting a Nexus phone, your best bet is to wait a little longer and then pick up the Nexus S, which is slated for release in less than a week.
Our Verizon list is dominated by Android phones, led by the Motorola Droid X. Its massive 4.3-inch display makes the Droid X a great portable media player, and the phone's quick processor gives the phone a speedy feel overall. The device's large screen and sleek design firmly establish the Droid X as the top phone on Verizon's network.
If you want all of the Droid X's power, but you aren't crazy about its size and design, the HTC Droid Incredible may be for you. HTC Sense, a skin for Android, gives the operating system a more polished look and adds some cool features, including a social media aggregator and a 3D weather app. The phone definitely lives up to its name: The device's stunning AMOLED display and good camera make it a solid alternative to the Droid X.